/* * New Interface to Process Table -- PROCTAB Stream (a la Directory streams) * Copyright (C) 1996 Charles L. Blake. * Copyright (C) 1998 Michael K. Johnson * Copyright 1998-2003 Albert Cahalan * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "version.h" #include "readproc.h" #include "alloc.h" #include "escape.h" #include "pwcache.h" #include "devname.h" #include "procps.h" #include #include #include #include #include #include #include #include #include #include #include #ifdef WITH_SYSTEMD #include #endif #ifdef WITH_ELOGIND #include #endif // sometimes it's easier to do this manually, w/o gcc helping #ifdef PROF extern void __cyg_profile_func_enter(void*,void*); #define ENTER(x) __cyg_profile_func_enter((void*)x,(void*)x) #define LEAVE(x) __cyg_profile_func_exit((void*)x,(void*)x) #else #define ENTER(x) #define LEAVE(x) #endif #ifdef QUICK_THREADS // used when multi-threaded and some memory must not be freed #define MK_THREAD(q) q->pad_1 = '\xee' #define IS_THREAD(q) ( q->pad_1 == '\xee' ) #endif // utility buffers of MAX_BUFSZ bytes each, available to // any function following an openproc() call static char *src_buffer, *dst_buffer; #define MAX_BUFSZ 1024*64*2 // dynamic 'utility' buffer support for file2str() calls struct utlbuf_s { char *buf; // dynamically grown buffer int siz; // current len of the above } utlbuf_s; #ifndef SIGNAL_STRING // convert hex string to unsigned long long static unsigned long long unhex(const char *restrict cp){ unsigned long long ull = 0; for(;;){ char c = *cp++; if(!( (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f') )) break; ull = (ull<<4) | (c - (c >= 'a' ? 'a'-10 : c >= 'A' ? 'A'-10 : '0')); } return ull; } #endif static int task_dir_missing; // free any additional dynamically acquired storage associated with a proc_t // ( and if it's to be reused, refresh it otherwise destroy it ) static inline void free_acquired (proc_t *p, int reuse) { #ifdef QUICK_THREADS if (!IS_THREAD(p)) { #endif if (p->environ) free((void*)*p->environ); if (p->cmdline) free((void*)*p->cmdline); if (p->cgroup) free((void*)*p->cgroup); if (p->cgname) free(p->cgname); if (p->supgid) free(p->supgid); if (p->supgrp) free(p->supgrp); if (p->sd_mach) free(p->sd_mach); if (p->sd_ouid) free(p->sd_ouid); if (p->sd_seat) free(p->sd_seat); if (p->sd_sess) free(p->sd_sess); if (p->sd_slice) free(p->sd_slice); if (p->sd_unit) free(p->sd_unit); if (p->sd_uunit) free(p->sd_uunit); #ifdef QUICK_THREADS } #endif memset(p, reuse ? '\0' : '\xff', sizeof(*p)); } /////////////////////////////////////////////////////////////////////////// typedef struct status_table_struct { unsigned char name[8]; // /proc/*/status field name unsigned char len; // name length #ifdef LABEL_OFFSET long offset; // jump address offset #else void *addr; #endif } status_table_struct; #ifdef LABEL_OFFSET #define F(x) {#x, sizeof(#x)-1, (long)(&&case_##x-&&base)}, #else #define F(x) {#x, sizeof(#x)-1, &&case_##x}, #endif #define NUL {"", 0, 0}, #define GPERF_TABLE_SIZE 128 // Derived from: // gperf -7 --language=ANSI-C --key-positions=1,3,4 -C -n -c // ( --key-positions verified by omission & reported "Computed positions" ) // // Suggested method: // Grep this file for "case_", then strip those down to the name. // Eliminate duplicates (due to #ifs), the ' case_' prefix and // any c comments. Leave the colon and newline so that "Pid:\n", // "Threads:\n", etc. would be lines, but no quote, no escape, etc. // // After a pipe through gperf, insert the resulting 'asso_values' // into our 'asso' array. Then convert the gperf 'wordlist' array // into our 'table' array by wrapping the string literals within // the F macro and replacing empty strings with the NUL define. // // In the status_table_struct watch out for name size (grrr, expanding) // and the number of entries. Currently, the table is padded to 128 // entries and we therefore mask with 127. static void status2proc(char *S, proc_t *restrict P, int is_proc){ long Threads = 0; long Tgid = 0; long Pid = 0; // 128 entries because we trust the kernel to use ASCII names static const unsigned char asso[] = { 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 6, 101, 101, 101, 101, 101, 101, 45, 55, 25, 31, 50, 50, 10, 0, 35, 101, 101, 21, 101, 30, 101, 20, 36, 0, 5, 0, 40, 0, 0, 101, 101, 101, 101, 101, 101, 101, 101, 101, 30, 101, 15, 0, 1, 101, 10, 101, 10, 101, 101, 101, 25, 101, 40, 0, 101, 0, 50, 6, 40, 101, 1, 35, 101, 101, 101, 101, 101, 101, 101 }; static const status_table_struct table[GPERF_TABLE_SIZE] = { F(VmHWM) F(Threads) NUL NUL NUL F(VmRSS) F(VmSwap) NUL NUL NUL F(Tgid) F(VmStk) NUL NUL NUL F(VmSize) F(Gid) NUL NUL NUL F(VmPTE) F(VmPeak) NUL NUL NUL F(ShdPnd) F(Pid) NUL NUL NUL F(PPid) F(VmLib) NUL NUL NUL F(SigPnd) F(VmLck) NUL NUL NUL F(SigCgt) F(State) NUL NUL NUL F(CapPrm) F(Uid) NUL NUL NUL F(SigIgn) F(SigQ) NUL NUL NUL F(RssShmem) F(Name) NUL NUL NUL F(CapInh) F(VmData) NUL NUL NUL F(FDSize) NUL NUL NUL NUL F(SigBlk) NUL NUL NUL NUL F(CapEff) NUL NUL NUL NUL F(CapBnd) NUL NUL NUL NUL F(VmExe) NUL NUL NUL NUL F(Groups) NUL NUL NUL NUL F(RssAnon) NUL NUL NUL NUL F(RssFile) }; #undef F #undef NUL ENTER(0x220); goto base; for(;;){ char *colon; status_table_struct entry; // advance to next line S = strchr(S, '\n'); if(unlikely(!S)) break; // if no newline S++; // examine a field name (hash and compare) base: if(unlikely(!*S)) break; entry = table[(GPERF_TABLE_SIZE -1) & (asso[(int)S[3]] + asso[(int)S[2]] + asso[(int)S[0]])]; colon = strchr(S, ':'); if(unlikely(!colon)) break; if(unlikely(colon[1]!='\t')) break; if(unlikely(colon-S != entry.len)) continue; if(unlikely(memcmp(entry.name,S,colon-S))) continue; S = colon+2; // past the '\t' #ifdef LABEL_OFFSET goto *(&&base + entry.offset); #else goto *entry.addr; #endif case_Name: { unsigned u = 0; while(u < sizeof P->cmd - 1u){ int c = *S++; if(unlikely(c=='\n')) break; if(unlikely(c=='\0')) break; // should never happen if(unlikely(c=='\\')){ c = *S++; if(c=='\n') break; // should never happen if(!c) break; // should never happen if(c=='n') c='\n'; // else we assume it is '\\' } P->cmd[u++] = c; } P->cmd[u] = '\0'; S--; // put back the '\n' or '\0' continue; } #ifdef SIGNAL_STRING case_ShdPnd: memcpy(P->signal, S, 16); P->signal[16] = '\0'; continue; case_SigBlk: memcpy(P->blocked, S, 16); P->blocked[16] = '\0'; continue; case_SigCgt: memcpy(P->sigcatch, S, 16); P->sigcatch[16] = '\0'; continue; case_SigIgn: memcpy(P->sigignore, S, 16); P->sigignore[16] = '\0'; continue; case_SigPnd: memcpy(P->_sigpnd, S, 16); P->_sigpnd[16] = '\0'; continue; #else case_ShdPnd: P->signal = unhex(S); continue; case_SigBlk: P->blocked = unhex(S); continue; case_SigCgt: P->sigcatch = unhex(S); continue; case_SigIgn: P->sigignore = unhex(S); continue; case_SigPnd: P->_sigpnd = unhex(S); continue; #endif case_State: P->state = *S; continue; case_Tgid: Tgid = strtol(S,&S,10); continue; case_Pid: Pid = strtol(S,&S,10); continue; case_PPid: P->ppid = strtol(S,&S,10); continue; case_Threads: Threads = strtol(S,&S,10); continue; case_Uid: P->ruid = strtol(S,&S,10); P->euid = strtol(S,&S,10); P->suid = strtol(S,&S,10); P->fuid = strtol(S,&S,10); continue; case_Gid: P->rgid = strtol(S,&S,10); P->egid = strtol(S,&S,10); P->sgid = strtol(S,&S,10); P->fgid = strtol(S,&S,10); continue; case_VmData: P->vm_data = strtol(S,&S,10); continue; case_VmExe: P->vm_exe = strtol(S,&S,10); continue; case_VmLck: P->vm_lock = strtol(S,&S,10); continue; case_VmLib: P->vm_lib = strtol(S,&S,10); continue; case_VmRSS: P->vm_rss = strtol(S,&S,10); continue; case_RssAnon: // subset of VmRSS, linux-4.5 P->vm_rss_anon = strtol(S,&S,10); continue; case_RssFile: // subset of VmRSS, linux-4.5 P->vm_rss_file = strtol(S,&S,10); continue; case_RssShmem: // subset of VmRSS, linux-4.5 P->vm_rss_shared = strtol(S,&S,10); continue; case_VmSize: P->vm_size = strtol(S,&S,10); continue; case_VmStk: P->vm_stack = strtol(S,&S,10); continue; case_VmSwap: // Linux 2.6.34 P->vm_swap = strtol(S,&S,10); continue; case_Groups: { char *nl = strchr(S, '\n'); int j = nl ? (nl - S) : strlen(S); if (j) { P->supgid = xmalloc(j+1); // +1 in case space disappears memcpy(P->supgid, S, j); if (unlikely(' ' != P->supgid[--j])) ++j; P->supgid[j] = '\0'; // whack the space or the newline for ( ; j; j--) if (' ' == P->supgid[j]) P->supgid[j] = ','; } continue; } case_CapBnd: case_CapEff: case_CapInh: case_CapPrm: case_FDSize: case_SigQ: case_VmHWM: // 2005, peak VmRSS unless VmRSS is bigger case_VmPTE: case_VmPeak: // 2005, peak VmSize unless VmSize is bigger continue; } #if 0 // recent kernels supply per-tgid pending signals if(is_proc && *ShdPnd){ memcpy(P->signal, ShdPnd, 16); P->signal[16] = '\0'; } #endif // recent kernels supply per-tgid pending signals #ifdef SIGNAL_STRING if(!is_proc || !P->signal[0]){ memcpy(P->signal, P->_sigpnd, 16); P->signal[16] = '\0'; } #else if(!is_proc){ P->signal = P->_sigpnd; } #endif // Linux 2.4.13-pre1 to max 2.4.xx have a useless "Tgid" // that is not initialized for built-in kernel tasks. // Only 2.6.0 and above have "Threads" (nlwp) info. if(Threads){ P->nlwp = Threads; P->tgid = Tgid; // the POSIX PID value P->tid = Pid; // the thread ID }else{ P->nlwp = 1; P->tgid = Pid; P->tid = Pid; } if (!P->supgid) P->supgid = xstrdup("-"); LEAVE(0x220); } #undef GPERF_TABLE_SIZE static void supgrps_from_supgids (proc_t *p) { char *g, *s; int t; if (!p->supgid || '-' == *p->supgid) { p->supgrp = xstrdup("-"); return; } s = p->supgid; t = 0; do { if (',' == *s) ++s; g = pwcache_get_group((uid_t)strtol(s, &s, 10)); p->supgrp = xrealloc(p->supgrp, P_G_SZ+t+2); t += snprintf(p->supgrp+t, P_G_SZ+2, "%s%s", t ? "," : "", g); } while (*s); } /////////////////////////////////////////////////////////////////////// static void oomscore2proc(const char* S, proc_t *restrict P) { sscanf(S, "%d", &P->oom_score); } static void oomadj2proc(const char* S, proc_t *restrict P) { sscanf(S, "%d", &P->oom_adj); } /////////////////////////////////////////////////////////////////////// static const char *ns_names[] = { [IPCNS] = "ipc", [MNTNS] = "mnt", [NETNS] = "net", [PIDNS] = "pid", [USERNS] = "user", [UTSNS] = "uts", }; const char *get_ns_name(int id) { if (id < 0 || id >= NUM_NS) return NULL; return ns_names[id]; } int get_ns_id(const char *name) { int i; if (!name) return -1; for (i = 0; i < NUM_NS; i++) if (!strcmp(ns_names[i], name)) return i; return -1; } static void ns2proc(const char *directory, proc_t *restrict p) { char path[PROCPATHLEN]; struct stat sb; int i; for (i = 0; i < NUM_NS; i++) { snprintf(path, sizeof(path), "%s/ns/%s", directory, ns_names[i]); if (0 == stat(path, &sb)) p->ns[i] = (long)sb.st_ino; #if 0 else // this allows a caller to distinguish p->ns[i] = -errno; // between the ENOENT or EACCES errors #endif } } static void sd2proc(proc_t *restrict p) { #if defined(WITH_SYSTEMD) || defined(WITH_ELOGIND) char buf[64]; uid_t uid; if (0 > sd_pid_get_machine_name(p->tid, &p->sd_mach)) p->sd_mach = strdup("-"); if (0 > sd_pid_get_owner_uid(p->tid, &uid)) p->sd_ouid = strdup("-"); else { snprintf(buf, sizeof(buf), "%d", (int)uid); p->sd_ouid = strdup(buf); } if (0 > sd_pid_get_session(p->tid, &p->sd_sess)) { p->sd_sess = strdup("-"); p->sd_seat = strdup("-"); } else { if (0 > sd_session_get_seat(p->sd_sess, &p->sd_seat)) p->sd_seat = strdup("-"); } if (0 > sd_pid_get_slice(p->tid, &p->sd_slice)) p->sd_slice = strdup("-"); if (0 > sd_pid_get_unit(p->tid, &p->sd_unit)) p->sd_unit = strdup("-"); if (0 > sd_pid_get_user_unit(p->tid, &p->sd_uunit)) p->sd_uunit = strdup("-"); #else p->sd_mach = strdup("?"); p->sd_ouid = strdup("?"); p->sd_seat = strdup("?"); p->sd_sess = strdup("?"); p->sd_slice = strdup("?"); p->sd_unit = strdup("?"); p->sd_uunit = strdup("?"); #endif } /////////////////////////////////////////////////////////////////////// // Reads /proc/*/stat files, being careful not to trip over processes with // names like ":-) 1 2 3 4 5 6". static void stat2proc(const char* S, proc_t *restrict P) { unsigned num; char* tmp; ENTER(0x160); /* fill in default values for older kernels */ P->processor = 0; P->rtprio = -1; P->sched = -1; P->nlwp = 0; S = strchr(S, '(') + 1; tmp = strrchr(S, ')'); num = tmp - S; if(unlikely(num >= sizeof P->cmd)) num = sizeof P->cmd - 1; memcpy(P->cmd, S, num); P->cmd[num] = '\0'; S = tmp + 2; // skip ") " num = sscanf(S, "%c " "%d %d %d %d %d " "%lu %lu %lu %lu %lu " "%llu %llu %llu %llu " /* utime stime cutime cstime */ "%ld %ld " "%d " "%ld " "%llu " /* start_time */ "%lu " "%ld " "%lu %"KLF"u %"KLF"u %"KLF"u %"KLF"u %"KLF"u " "%*s %*s %*s %*s " /* discard, no RT signals & Linux 2.1 used hex */ "%"KLF"u %*u %*u " "%d %d " "%lu %lu", &P->state, &P->ppid, &P->pgrp, &P->session, &P->tty, &P->tpgid, &P->flags, &P->min_flt, &P->cmin_flt, &P->maj_flt, &P->cmaj_flt, &P->utime, &P->stime, &P->cutime, &P->cstime, &P->priority, &P->nice, &P->nlwp, &P->alarm, &P->start_time, &P->vsize, &P->rss, &P->rss_rlim, &P->start_code, &P->end_code, &P->start_stack, &P->kstk_esp, &P->kstk_eip, /* P->signal, P->blocked, P->sigignore, P->sigcatch, */ /* can't use */ &P->wchan, /* &P->nswap, &P->cnswap, */ /* nswap and cnswap dead for 2.4.xx and up */ /* -- Linux 2.0.35 ends here -- */ &P->exit_signal, &P->processor, /* 2.2.1 ends with "exit_signal" */ /* -- Linux 2.2.8 to 2.5.17 end here -- */ &P->rtprio, &P->sched /* both added to 2.5.18 */ ); if(!P->nlwp){ P->nlwp = 1; } LEAVE(0x160); } ///////////////////////////////////////////////////////////////////////// static void statm2proc(const char* s, proc_t *restrict P) { sscanf(s, "%ld %ld %ld %ld %ld %ld %ld", &P->size, &P->resident, &P->share, &P->trs, &P->lrs, &P->drs, &P->dt); } static int file2str(const char *directory, const char *what, struct utlbuf_s *ub) { #define buffGRW 1024 char path[PROCPATHLEN]; int fd, num, tot_read = 0; /* on first use we preallocate a buffer of minimum size to emulate former 'local static' behavior -- even if this read fails, that buffer will likely soon be used for another subdirectory anyway ( besides, with this xcalloc we will never need to use memcpy ) */ if (ub->buf) ub->buf[0] = '\0'; else ub->buf = xcalloc((ub->siz = buffGRW)); sprintf(path, "%s/%s", directory, what); if (-1 == (fd = open(path, O_RDONLY, 0))) return -1; while (0 < (num = read(fd, ub->buf + tot_read, ub->siz - tot_read))) { tot_read += num; if (tot_read < ub->siz) break; ub->buf = xrealloc(ub->buf, (ub->siz += buffGRW)); }; ub->buf[tot_read] = '\0'; close(fd); if (unlikely(tot_read < 1)) return -1; return tot_read; #undef buffGRW } static char** file2strvec(const char* directory, const char* what) { char buf[2048]; /* read buf bytes at a time */ char *p, *rbuf = 0, *endbuf, **q, **ret; int fd, tot = 0, n, c, end_of_file = 0; int align; sprintf(buf, "%s/%s", directory, what); fd = open(buf, O_RDONLY, 0); if(fd==-1) return NULL; /* read whole file into a memory buffer, allocating as we go */ while ((n = read(fd, buf, sizeof buf - 1)) >= 0) { if (n < (int)(sizeof buf - 1)) end_of_file = 1; if (n == 0 && rbuf == 0) { close(fd); return NULL; /* process died between our open and read */ } if (n < 0) { if (rbuf) free(rbuf); close(fd); return NULL; /* read error */ } if (end_of_file && (n == 0 || buf[n-1]))/* last read char not null */ buf[n++] = '\0'; /* so append null-terminator */ rbuf = xrealloc(rbuf, tot + n); /* allocate more memory */ memcpy(rbuf + tot, buf, n); /* copy buffer into it */ tot += n; /* increment total byte ctr */ if (end_of_file) break; } close(fd); if (n <= 0 && !end_of_file) { if (rbuf) free(rbuf); return NULL; /* read error */ } endbuf = rbuf + tot; /* count space for pointers */ align = (sizeof(char*)-1) - ((tot + sizeof(char*)-1) & (sizeof(char*)-1)); for (c = 0, p = rbuf; p < endbuf; p++) { if (!*p || *p == '\n') c += sizeof(char*); if (*p == '\n') *p = 0; } c += sizeof(char*); /* one extra for NULL term */ rbuf = xrealloc(rbuf, tot + c + align); /* make room for ptrs AT END */ endbuf = rbuf + tot; /* addr just past data buf */ q = ret = (char**) (endbuf+align); /* ==> free(*ret) to dealloc */ *q++ = p = rbuf; /* point ptrs to the strings */ endbuf--; /* do not traverse final NUL */ while (++p < endbuf) if (!*p) /* NUL char implies that */ *q++ = p+1; /* next string -> next char */ *q = 0; /* null ptr list terminator */ return ret; } // this is the former under utilized 'read_cmdline', which has been // generalized in support of these new libproc flags: // PROC_EDITCGRPCVT, PROC_EDITCMDLCVT and PROC_EDITENVRCVT static int read_unvectored(char *restrict const dst, unsigned sz, const char* whom, const char *what, char sep) { char path[PROCPATHLEN]; int fd; unsigned n = 0; snprintf(path, sizeof(path), "%s/%s", whom, what); fd = open(path, O_RDONLY); if(fd==-1) return 0; for(;;){ ssize_t r = read(fd,dst+n,sz-n); if(r==-1){ if(errno==EINTR) continue; break; } n += r; if(n==sz) { // filled the buffer --n; // make room for '\0' break; } if(r==0) break; // EOF } close(fd); if(n){ int i=n; while(i && dst[i-1]=='\0') --i; // skip trailing zeroes while(i--) if(dst[i]=='\n' || dst[i]=='\0') dst[i]=sep; if(dst[n-1]==' ') dst[n-1]='\0'; } dst[n] = '\0'; return n; } static char** vectorize_this_str (const char* src) { #define pSZ (sizeof(char*)) char *cpy, **vec; int adj, tot; tot = strlen(src) + 1; // prep for our vectors adj = (pSZ-1) - ((tot + pSZ-1) & (pSZ-1)); // calc alignment bytes cpy = xcalloc(tot + adj + (2 * pSZ)); // get new larger buffer snprintf(cpy, tot, "%s", src); // duplicate their string vec = (char**)(cpy + tot + adj); // prep pointer to pointers *vec = cpy; // point 1st vector to string *(vec+1) = NULL; // null ptr 'list' delimit return vec; // ==> free(*vec) to dealloc #undef pSZ } // This routine reads a 'cgroup' for the designated proc_t. // It is similar to file2strvec except we filter and concatenate // the data into a single string represented as a single vector. static void fill_cgroup_cvt (const char* directory, proc_t *restrict p) { #define vMAX ( MAX_BUFSZ - (int)(dst - dst_buffer) ) char *src, *dst, *grp, *eob, *name; int tot, x, whackable_int = MAX_BUFSZ; *(dst = dst_buffer) = '\0'; // empty destination tot = read_unvectored(src_buffer, MAX_BUFSZ, directory, "cgroup", '\0'); for (src = src_buffer, eob = src_buffer + tot; src < eob; src += x) { x = 1; // loop assist if (!*src) continue; x = strlen((grp = src)); if ('/' == grp[x - 1]) continue; // skip empty root cgroups #if 0 grp += strspn(grp, "0123456789:"); // jump past group number #endif dst += snprintf(dst, vMAX, "%s", (dst > dst_buffer) ? "," : ""); dst += escape_str(dst, grp, vMAX, &whackable_int); } p->cgroup = vectorize_this_str(dst_buffer[0] ? dst_buffer : "-"); name = strstr(p->cgroup[0], ":name="); if (name && *(name+6)) name += 6; else name = p->cgroup[0]; p->cgname = strdup(name); #undef vMAX } // This routine reads a 'cmdline' for the designated proc_t, "escapes" // the result into a single string represented as a single vector // and guarantees the caller a valid proc_t.cmdline pointer. static void fill_cmdline_cvt (const char* directory, proc_t *restrict p) { #define uFLG ( ESC_BRACKETS | ESC_DEFUNCT ) int whackable_int = MAX_BUFSZ; if (read_unvectored(src_buffer, MAX_BUFSZ, directory, "cmdline", ' ')) escape_str(dst_buffer, src_buffer, MAX_BUFSZ, &whackable_int); else escape_command(dst_buffer, p, MAX_BUFSZ, &whackable_int, uFLG); p->cmdline = vectorize_this_str(dst_buffer); #undef uFLG } // This routine reads an 'environ' for the designated proc_t and // guarantees the caller a valid proc_t.environ pointer. static void fill_environ_cvt (const char* directory, proc_t *restrict p) { int whackable_int = MAX_BUFSZ; dst_buffer[0] = '\0'; if (read_unvectored(src_buffer, MAX_BUFSZ, directory, "environ", ' ')) escape_str(dst_buffer, src_buffer, MAX_BUFSZ, &whackable_int); p->environ = vectorize_this_str(dst_buffer[0] ? dst_buffer : "-"); } // warning: interface may change int read_cmdline(char *restrict const dst, unsigned sz, unsigned pid) { char path[PROCPATHLEN]; snprintf(path, sizeof(path), "/proc/%u", pid); return read_unvectored(dst, sz, path, "cmdline", ' '); } // Provide the means to value proc_t.lxcname (perhaps only with "-") while // tracking all names already seen thus avoiding the overhead of repeating // malloc() and free() calls. static const char *lxc_containers (const char *path) { static struct utlbuf_s ub = { NULL, 0 }; // util buffer for whole cgroup static char lxc_none[] = "-"; /* try to locate the lxc delimiter eyecatcher somewhere in a task's cgroup directory -- the following are from nested privileged plus unprivileged containers, where the '/lxc/' delimiter precedes the container name ... 10:cpuset:/lxc/lxc-P/lxc/lxc-P-nested 10:cpuset:/user.slice/user-1000.slice/session-c2.scope/lxc/lxc-U/lxc/lxc-U-nested ... some minor complications are the potential addition of more cgroups for a controller displacing the lxc name (normally last on a line), and environments with unexpected /proc/##/cgroup ordering/contents as with: 10:cpuset:/lxc/lxc-P/lxc/lxc-P-nested/MY-NEW-CGROUP or 2:name=systemd:/ 1:cpuset,cpu,cpuacct,devices,freezer,net_cls,blkio,perf_event,net_prio:/lxc/lxc-P */ if (file2str(path, "cgroup", &ub) > 0) { static const char lxc_delm[] = "/lxc/"; char *p1; if ((p1 = strstr(ub.buf, lxc_delm))) { static struct lxc_ele { struct lxc_ele *next; const char *name; } *anchor = NULL; struct lxc_ele *ele = anchor; char *p2; if ((p2 = strchr(p1, '\n'))) // isolate a controller's line *p2 = '\0'; do { // deal with nested containers p2 = p1 + (sizeof(lxc_delm)-1); p1 = strstr(p2, lxc_delm); } while (p1); if ((p1 = strchr(p2, '/'))) // isolate name only substring *p1 = '\0'; while (ele) { // have we already seen a name if (!strcmp(ele->name, p2)) return ele->name; // return just a recycled name ele = ele->next; } ele = (struct lxc_ele *)xmalloc(sizeof(struct lxc_ele)); ele->name = xstrdup(p2); ele->next = anchor; // push the new container name anchor = ele; return ele->name; // return a new container name } } return lxc_none; } /////////////////////////////////////////////////////////////////////// /* These are some nice GNU C expression subscope "inline" functions. * The can be used with arbitrary types and evaluate their arguments * exactly once. */ /* Test if item X of type T is present in the 0 terminated list L */ # define XinL(T, X, L) ( { \ T x = (X), *l = (L); \ while (*l && *l != x) l++; \ *l == x; \ } ) /* Test if item X of type T is present in the list L of length N */ # define XinLN(T, X, L, N) ( { \ T x = (X), *l = (L); \ int i = 0, n = (N); \ while (i < n && l[i] != x) i++; \ i < n && l[i] == x; \ } ) ////////////////////////////////////////////////////////////////////////////////// // This reads process info from /proc in the traditional way, for one process. // The pid (tgid? tid?) is already in p, and a path to it in path, with some // room to spare. static proc_t* simple_readproc(PROCTAB *restrict const PT, proc_t *restrict const p) { static struct utlbuf_s ub = { NULL, 0 }; // buf for stat,statm,status static struct stat sb; // stat() buffer char *restrict const path = PT->path; unsigned flags = PT->flags; if (unlikely(stat(path, &sb) == -1)) /* no such dirent (anymore) */ goto next_proc; if ((flags & PROC_UID) && !XinLN(uid_t, sb.st_uid, PT->uids, PT->nuid)) goto next_proc; /* not one of the requested uids */ p->euid = sb.st_uid; /* need a way to get real uid */ p->egid = sb.st_gid; /* need a way to get real gid */ if (flags & PROC_FILLSTAT) { // read /proc/#/stat if (unlikely(file2str(path, "stat", &ub) == -1)) goto next_proc; stat2proc(ub.buf, p); } if (flags & PROC_FILLMEM) { // read /proc/#/statm if (likely(file2str(path, "statm", &ub) != -1)) statm2proc(ub.buf, p); } if (flags & PROC_FILLSTATUS) { // read /proc/#/status if (likely(file2str(path, "status", &ub) != -1)){ status2proc(ub.buf, p, 1); if (flags & PROC_FILLSUPGRP) supgrps_from_supgids(p); } } // if multithreaded, some values are crap if(p->nlwp > 1){ p->wchan = (KLONG)~0ull; } /* some number->text resolving which is time consuming */ if (flags & PROC_FILLUSR){ memcpy(p->euser, pwcache_get_user(p->euid), sizeof p->euser); if(flags & PROC_FILLSTATUS) { memcpy(p->ruser, pwcache_get_user(p->ruid), sizeof p->ruser); memcpy(p->suser, pwcache_get_user(p->suid), sizeof p->suser); memcpy(p->fuser, pwcache_get_user(p->fuid), sizeof p->fuser); } } /* some number->text resolving which is time consuming */ if (flags & PROC_FILLGRP){ memcpy(p->egroup, pwcache_get_group(p->egid), sizeof p->egroup); if(flags & PROC_FILLSTATUS) { memcpy(p->rgroup, pwcache_get_group(p->rgid), sizeof p->rgroup); memcpy(p->sgroup, pwcache_get_group(p->sgid), sizeof p->sgroup); memcpy(p->fgroup, pwcache_get_group(p->fgid), sizeof p->fgroup); } } if (unlikely(flags & PROC_FILLENV)) { // read /proc/#/environ if (flags & PROC_EDITENVRCVT) fill_environ_cvt(path, p); else p->environ = file2strvec(path, "environ"); } if (flags & (PROC_FILLCOM|PROC_FILLARG)) { // read /proc/#/cmdline if (flags & PROC_EDITCMDLCVT) fill_cmdline_cvt(path, p); else p->cmdline = file2strvec(path, "cmdline"); } if ((flags & PROC_FILLCGROUP)) { // read /proc/#/cgroup if (flags & PROC_EDITCGRPCVT) fill_cgroup_cvt(path, p); else p->cgroup = file2strvec(path, "cgroup"); } if (unlikely(flags & PROC_FILLOOM)) { if (likely(file2str(path, "oom_score", &ub) != -1)) oomscore2proc(ub.buf, p); if (likely(file2str(path, "oom_adj", &ub) != -1)) oomadj2proc(ub.buf, p); } if (unlikely(flags & PROC_FILLNS)) // read /proc/#/ns/* ns2proc(path, p); if (unlikely(flags & PROC_FILLSYSTEMD)) // get sd-login.h stuff sd2proc(p); if (unlikely(flags & PROC_FILL_LXC)) // value the lxc name p->lxcname = lxc_containers(path); return p; next_proc: return NULL; } ////////////////////////////////////////////////////////////////////////////////// // This reads /proc/*/task/* data, for one task. #ifdef QUICK_THREADS // p is the POSIX process (task group summary) & source for some copies if !NULL #else // p is the POSIX process (task group summary) (not needed by THIS implementation) #endif // t is the POSIX thread (task group member, generally not the leader) // path is a path to the task, with some room to spare. static proc_t* simple_readtask(PROCTAB *restrict const PT, const proc_t *restrict const p, proc_t *restrict const t, char *restrict const path) { static struct utlbuf_s ub = { NULL, 0 }; // buf for stat,statm,status static struct stat sb; // stat() buffer unsigned flags = PT->flags; if (unlikely(stat(path, &sb) == -1)) /* no such dirent (anymore) */ goto next_task; // if ((flags & PROC_UID) && !XinLN(uid_t, sb.st_uid, PT->uids, PT->nuid)) // goto next_task; /* not one of the requested uids */ t->euid = sb.st_uid; /* need a way to get real uid */ t->egid = sb.st_gid; /* need a way to get real gid */ if (flags & PROC_FILLSTAT) { // read /proc/#/task/#/stat if (unlikely(file2str(path, "stat", &ub) == -1)) goto next_task; stat2proc(ub.buf, t); } #ifndef QUICK_THREADS if (flags & PROC_FILLMEM) // read /proc/#/task/#statm if (likely(file2str(path, "statm", &ub) != -1)) statm2proc(ub.buf, t); #endif if (flags & PROC_FILLSTATUS) { // read /proc/#/task/#/status if (likely(file2str(path, "status", &ub) != -1)) { status2proc(ub.buf, t, 0); #ifndef QUICK_THREADS if (flags & PROC_FILLSUPGRP) supgrps_from_supgids(t); #endif } } /* some number->text resolving which is time consuming */ if (flags & PROC_FILLUSR){ memcpy(t->euser, pwcache_get_user(t->euid), sizeof t->euser); if(flags & PROC_FILLSTATUS) { memcpy(t->ruser, pwcache_get_user(t->ruid), sizeof t->ruser); memcpy(t->suser, pwcache_get_user(t->suid), sizeof t->suser); memcpy(t->fuser, pwcache_get_user(t->fuid), sizeof t->fuser); } } /* some number->text resolving which is time consuming */ if (flags & PROC_FILLGRP){ memcpy(t->egroup, pwcache_get_group(t->egid), sizeof t->egroup); if(flags & PROC_FILLSTATUS) { memcpy(t->rgroup, pwcache_get_group(t->rgid), sizeof t->rgroup); memcpy(t->sgroup, pwcache_get_group(t->sgid), sizeof t->sgroup); memcpy(t->fgroup, pwcache_get_group(t->fgid), sizeof t->fgroup); } } #ifdef QUICK_THREADS if (!p) { if (flags & PROC_FILLMEM) if (likely(file2str(path, "statm", &ub) != -1)) statm2proc(ub.buf, t); if (flags & PROC_FILLSUPGRP) supgrps_from_supgids(t); #endif if (unlikely(flags & PROC_FILLENV)) { // read /proc/#/task/#/environ if (flags & PROC_EDITENVRCVT) fill_environ_cvt(path, t); else t->environ = file2strvec(path, "environ"); } if (flags & (PROC_FILLCOM|PROC_FILLARG)) { // read /proc/#/task/#/cmdline if (flags & PROC_EDITCMDLCVT) fill_cmdline_cvt(path, t); else t->cmdline = file2strvec(path, "cmdline"); } if ((flags & PROC_FILLCGROUP)) { // read /proc/#/task/#/cgroup if (flags & PROC_EDITCGRPCVT) fill_cgroup_cvt(path, t); else t->cgroup = file2strvec(path, "cgroup"); } if (unlikely(flags & PROC_FILLSYSTEMD)) // get sd-login.h stuff sd2proc(t); if (unlikely(flags & PROC_FILL_LXC)) // value the lxc name t->lxcname = lxc_containers(path); #ifdef QUICK_THREADS } else { t->size = p->size; t->resident = p->resident; t->share = p->share; t->trs = p->trs; t->lrs = p->lrs; t->drs = p->drs; t->dt = p->dt; t->cmdline = p->cmdline; // better not free these until done with all threads! t->environ = p->environ; t->cgname = p->cgname; t->cgroup = p->cgroup; if (t->supgid) free(t->supgid); t->supgid = p->supgid; t->supgrp = p->supgrp; t->sd_mach = p->sd_mach; t->sd_ouid = p->sd_ouid; t->sd_seat = p->sd_seat; t->sd_sess = p->sd_sess; t->sd_slice = p->sd_slice; t->sd_unit = p->sd_unit; t->sd_uunit = p->sd_uunit; t->lxcname = p->lxcname; MK_THREAD(t); } #endif if (unlikely(flags & PROC_FILLOOM)) { if (likely(file2str(path, "oom_score", &ub) != -1)) oomscore2proc(ub.buf, t); if (likely(file2str(path, "oom_adj", &ub) != -1)) oomadj2proc(ub.buf, t); } if (unlikely(flags & PROC_FILLNS)) // read /proc/#/task/#/ns/* ns2proc(path, t); return t; next_task: return NULL; #ifndef QUICK_THREADS (void)p; #endif } ////////////////////////////////////////////////////////////////////////////////// // This finds processes in /proc in the traditional way. // Return non-zero on success. static int simple_nextpid(PROCTAB *restrict const PT, proc_t *restrict const p) { static struct dirent *ent; /* dirent handle */ char *restrict const path = PT->path; for (;;) { ent = readdir(PT->procfs); if(unlikely(unlikely(!ent) || unlikely(!ent->d_name[0]))) return 0; if(likely(likely(*ent->d_name > '0') && likely(*ent->d_name <= '9'))) break; } p->tgid = strtoul(ent->d_name, NULL, 10); p->tid = p->tgid; memcpy(path, "/proc/", 6); strcpy(path+6, ent->d_name); // trust /proc to not contain evil top-level entries return 1; } ////////////////////////////////////////////////////////////////////////////////// // This finds tasks in /proc/*/task/ in the traditional way. // Return non-zero on success. static int simple_nexttid(PROCTAB *restrict const PT, const proc_t *restrict const p, proc_t *restrict const t, char *restrict const path) { static struct dirent *ent; /* dirent handle */ if(PT->taskdir_user != p->tgid){ if(PT->taskdir){ closedir(PT->taskdir); } // use "path" as some tmp space snprintf(path, PROCPATHLEN, "/proc/%d/task", p->tgid); PT->taskdir = opendir(path); if(!PT->taskdir) return 0; PT->taskdir_user = p->tgid; } for (;;) { ent = readdir(PT->taskdir); if(unlikely(unlikely(!ent) || unlikely(!ent->d_name[0]))) return 0; if(likely(likely(*ent->d_name > '0') && likely(*ent->d_name <= '9'))) break; } t->tid = strtoul(ent->d_name, NULL, 10); t->tgid = p->tgid; //t->ppid = p->ppid; // cover for kernel behavior? we want both actually...? snprintf(path, PROCPATHLEN, "/proc/%d/task/%s", p->tgid, ent->d_name); return 1; } ////////////////////////////////////////////////////////////////////////////////// // This "finds" processes in a list that was given to openproc(). // Return non-zero on success. (tgid was handy) static int listed_nextpid(PROCTAB *restrict const PT, proc_t *restrict const p) { char *restrict const path = PT->path; pid_t tgid = *(PT->pids)++; if(likely(tgid)){ snprintf(path, PROCPATHLEN, "/proc/%d", tgid); p->tgid = tgid; p->tid = tgid; // they match for leaders } return tgid; } ////////////////////////////////////////////////////////////////////////////////// /* readproc: return a pointer to a proc_t filled with requested info about the * next process available matching the restriction set. If no more such * processes are available, return a null pointer (boolean false). Use the * passed buffer instead of allocating space if it is non-NULL. */ /* This is optimized so that if a PID list is given, only those files are * searched for in /proc. If other lists are given in addition to the PID list, * the same logic can follow through as for the no-PID list case. This is * fairly complex, but it does try to not to do any unnecessary work. */ proc_t* readproc(PROCTAB *restrict const PT, proc_t *restrict p) { proc_t *ret; proc_t *saved_p; PT->did_fake=0; // if (PT->taskdir) { // closedir(PT->taskdir); // PT->taskdir = NULL; // PT->taskdir_user = -1; // } saved_p = p; if(!p) p = xcalloc(sizeof *p); else free_acquired(p, 1); for(;;){ // fills in the path, plus p->tid and p->tgid if (unlikely(!PT->finder(PT,p))) goto out; // go read the process data ret = PT->reader(PT,p); if(ret) return ret; } out: if(!saved_p) free(p); // FIXME: maybe set tid to -1 here, for "-" in display? return NULL; } ////////////////////////////////////////////////////////////////////////////////// // readtask: return a pointer to a proc_t filled with requested info about the // next task available. If no more such tasks are available, return a null // pointer (boolean false). Use the passed buffer instead of allocating // space if it is non-NULL. proc_t* readtask(PROCTAB *restrict const PT, const proc_t *restrict const p, proc_t *restrict t) { char path[PROCPATHLEN]; // must hold /proc/2000222000/task/2000222000/cmdline proc_t *ret; proc_t *saved_t; saved_t = t; if(!t) t = xcalloc(sizeof *t); else free_acquired(t, 1); // 1. got to fake a thread for old kernels #ifdef QUICK_THREADS // 2. for single-threaded processes, this is faster (but must patch up stuff that differs!) if(task_dir_missing || p->nlwp < 2){ #else if(task_dir_missing){ #endif if(PT->did_fake) goto out; PT->did_fake=1; memcpy(t,p,sizeof(proc_t)); // use the per-task pending, not per-tgid pending #ifdef SIGNAL_STRING memcpy(&t->signal, &t->_sigpnd, sizeof t->signal); #else t->signal = t->_sigpnd; #endif #ifdef QUICK_THREADS MK_THREAD(t); #else t->environ = NULL; t->cmdline = vectorize_this_str("n/a"); t->cgroup = NULL; t->supgid = NULL; t->supgrp = NULL; #endif return t; } for(;;){ // fills in the path, plus t->tid and t->tgid if (unlikely(!PT->taskfinder(PT,p,t,path))) goto out; // simple_nexttid // go read the task data ret = PT->taskreader(PT,p,t,path); // simple_readtask if(ret) return ret; } out: if(!saved_t) free(t); return NULL; } ////////////////////////////////////////////////////////////////////////////////// // readeither: return a pointer to a proc_t filled with requested info about // the next unique process or task available. If no more are available, // return a null pointer (boolean false). Use the passed buffer instead // of allocating space if it is non-NULL. proc_t* readeither (PROCTAB *restrict const PT, proc_t *restrict x) { static proc_t skel_p; // skeleton proc_t, only uses tid + tgid static proc_t *new_p; // for process/task transitions char path[PROCPATHLEN]; proc_t *saved_x, *ret; saved_x = x; if (!x) x = xcalloc(sizeof(*x)); else free_acquired(x,1); if (new_p) goto next_task; next_proc: new_p = NULL; for (;;) { // fills in the PT->path, plus skel_p.tid and skel_p.tgid if (!PT->finder(PT,&skel_p)) goto end_procs; // simple_nextpid if (!task_dir_missing) break; if ((ret = PT->reader(PT,x))) return ret; // simple_readproc } next_task: // fills in our path, plus x->tid and x->tgid if ((!(PT->taskfinder(PT,&skel_p,x,path))) // simple_nexttid || (!(ret = PT->taskreader(PT,new_p,x,path)))) { // simple_readtask goto next_proc; } if (!new_p) new_p = ret; return ret; end_procs: if (!saved_x) free(x); return NULL; } ////////////////////////////////////////////////////////////////////////////////// // initiate a process table scan PROCTAB* openproc(int flags, ...) { va_list ap; struct stat sbuf; static int did_stat; PROCTAB* PT = xmalloc(sizeof(PROCTAB)); if (!did_stat){ task_dir_missing = stat("/proc/self/task", &sbuf); did_stat = 1; } PT->taskdir = NULL; PT->taskdir_user = -1; PT->taskfinder = simple_nexttid; PT->taskreader = simple_readtask; PT->reader = simple_readproc; if (flags & PROC_PID){ PT->procfs = NULL; PT->finder = listed_nextpid; }else{ PT->procfs = opendir("/proc"); if (!PT->procfs) { free(PT); return NULL; } PT->finder = simple_nextpid; } PT->flags = flags; va_start(ap, flags); if (flags & PROC_PID) PT->pids = va_arg(ap, pid_t*); else if (flags & PROC_UID){ PT->uids = va_arg(ap, uid_t*); PT->nuid = va_arg(ap, int); } va_end(ap); if (!src_buffer){ src_buffer = xmalloc(MAX_BUFSZ); dst_buffer = xmalloc(MAX_BUFSZ); } return PT; } // terminate a process table scan void closeproc(PROCTAB* PT) { if (PT){ if (PT->procfs) closedir(PT->procfs); if (PT->taskdir) closedir(PT->taskdir); memset(PT,'#',sizeof(PROCTAB)); free(PT); } } // deallocate space allocated by readproc void freeproc(proc_t* p) { if (p) { free_acquired(p, 0); free(p); } } ////////////////////////////////////////////////////////////////////////////////// void look_up_our_self(proc_t *p) { struct utlbuf_s ub = { NULL, 0 }; if(file2str("/proc/self", "stat", &ub) == -1){ fprintf(stderr, "Error, do this: mount -t proc proc /proc\n"); _exit(47); } stat2proc(ub.buf, p); // parse /proc/self/stat free(ub.buf); } HIDDEN_ALIAS(readproc); HIDDEN_ALIAS(readtask); HIDDEN_ALIAS(readeither); /* Convenient wrapper around openproc and readproc to slurp in the whole process * table subset satisfying the constraints of flags and the optional PID list. * Free allocated memory with exit(). Access via tab[N]->member. The pointer * list is NULL terminated. */ proc_t** readproctab(int flags, ...) { PROCTAB* PT = NULL; proc_t** tab = NULL; int n = 0; va_list ap; va_start(ap, flags); /* pass through args to openproc */ if (flags & PROC_UID) { /* temporary variables to ensure that va_arg() instances * are called in the right order */ uid_t* u; int i; u = va_arg(ap, uid_t*); i = va_arg(ap, int); PT = openproc(flags, u, i); } else if (flags & PROC_PID) PT = openproc(flags, va_arg(ap, void*)); /* assume ptr sizes same */ else PT = openproc(flags); va_end(ap); if (!PT) return 0; do { /* read table: */ tab = xrealloc(tab, (n+1)*sizeof(proc_t*));/* realloc as we go, using */ tab[n] = readproc_direct(PT, NULL); /* final null to terminate */ } while (tab[n++]); /* stop when NULL reached */ closeproc(PT); return tab; } // Try again, this time with threads and selection. proc_data_t *readproctab2(int(*want_proc)(proc_t *buf), int(*want_task)(proc_t *buf), PROCTAB *restrict const PT) { static proc_data_t pd; proc_t** ptab = NULL; unsigned n_proc_alloc = 0; unsigned n_proc = 0; proc_t** ttab = NULL; unsigned n_task_alloc = 0; unsigned n_task = 0; proc_t* data = NULL; unsigned n_alloc = 0; unsigned long n_used = 0; for(;;){ proc_t *tmp; if(n_alloc == n_used){ //proc_t *old = data; n_alloc = n_alloc*5/4+30; // grow by over 25% data = xrealloc(data,sizeof(proc_t)*n_alloc); memset(data+n_used, 0, sizeof(proc_t)*(n_alloc-n_used)); } if(n_proc_alloc == n_proc){ //proc_t **old = ptab; n_proc_alloc = n_proc_alloc*5/4+30; // grow by over 25% ptab = xrealloc(ptab,sizeof(proc_t*)*n_proc_alloc); } tmp = readproc_direct(PT, data+n_used); if(!tmp) break; if(!want_proc(tmp)) continue; ptab[n_proc++] = (proc_t*)(n_used++); if(!( PT->flags & PROC_LOOSE_TASKS )) continue; for(;;){ proc_t *t; if(n_alloc == n_used){ proc_t *old = data; n_alloc = n_alloc*5/4+30; // grow by over 25% data = xrealloc(data,sizeof(proc_t)*n_alloc); // have to move tmp too tmp = data+(tmp-old); memset(data+n_used+1, 0, sizeof(proc_t)*(n_alloc-(n_used+1))); } if(n_task_alloc == n_task){ //proc_t **old = ttab; n_task_alloc = n_task_alloc*5/4+1; // grow by over 25% ttab = xrealloc(ttab,sizeof(proc_t*)*n_task_alloc); } t = readtask_direct(PT, tmp, data+n_used); if(!t) break; if(!want_task(t)) continue; ttab[n_task++] = (proc_t*)(n_used++); } } pd.proc = ptab; pd.task = ttab; pd.nproc = n_proc; pd.ntask = n_task; if(PT->flags & PROC_LOOSE_TASKS){ pd.tab = ttab; pd.n = n_task; }else{ pd.tab = ptab; pd.n = n_proc; } // change array indexes to pointers while(n_proc--) ptab[n_proc] = data+(long)(ptab[n_proc]); while(n_task--) ttab[n_task] = data+(long)(ttab[n_task]); return &pd; } // Try try yet again, this time treating processes and threads the same... proc_data_t *readproctab3 (int(*want_task)(proc_t *buf), PROCTAB *restrict const PT) { static proc_data_t pd; proc_t **tab = NULL; unsigned n_alloc = 0; unsigned n_used = 0; proc_t *p = NULL; for (;;) { if (n_alloc == n_used) { n_alloc = n_alloc*5/4+30; // grow by over 25% tab = xrealloc(tab,sizeof(proc_t*)*n_alloc); } // let this next guy allocate the necessary proc_t storage // (or recycle it) since he can't tolerate realloc relocations if (!(p = readeither_direct(PT,p))) break; if (want_task(p)) { tab[n_used++] = p; p = NULL; } } pd.tab = tab; pd.n = n_used; return &pd; } /* * get_proc_stats - lookup a single tasks information and fill out a proc_t * * On failure, returns NULL. On success, returns 'p' and 'p' is a valid * and filled out proc_t structure. */ proc_t * get_proc_stats(pid_t pid, proc_t *p) { struct utlbuf_s ub = { NULL, 0 }; static char path[32]; struct stat statbuf; sprintf(path, "/proc/%d", pid); if (stat(path, &statbuf)) { perror("stat"); return NULL; } if (file2str(path, "stat", &ub) >= 0) stat2proc(ub.buf, p); if (file2str(path, "statm", &ub) >= 0) statm2proc(ub.buf, p); if (file2str(path, "status", &ub) >= 0) status2proc(ub.buf, p, 0); free(ub.buf); return p; } #undef MK_THREAD #undef IS_THREAD #undef MAX_BUFSZ