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procps/ps/parser.c

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/*
* Copyright 1998-2003 by Albert Cahalan; all rights reserved.
* This file may be used subject to the terms and conditions of the
* GNU Library General Public License Version 2, or any later version
* at your option, as published by the Free Software Foundation.
* This program 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 Library General Public License for more details.
*/
/* Ought to have debug print stuff like this:
* #define Print(fmt, args...) printf("Debug: " fmt, ## args)
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/* username lookups */
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <sys/stat.h>
#include <unistd.h>
#include "common.h"
#include "../proc/version.h"
#define ARG_GNU 0
#define ARG_END 1
#define ARG_PGRP 2
#define ARG_SYSV 3
#define ARG_PID 4
#define ARG_BSD 5
#define ARG_FAIL 6
#define ARG_SESS 7
static int w_count = 0;
static int ps_argc; /* global argc */
static char **ps_argv; /* global argv */
static int thisarg; /* index into ps_argv */
static char *flagptr; /* current location in ps_argv[thisarg] */
static int not_pure_unix = 0; /* set by BSD and GNU options */
static int force_bsd = 0; /* set when normal parsing fails */
#define exclusive(x) if((ps_argc != 2) || strcmp(ps_argv[1],x))\
return "The " x " option is exclusive."
/********** utility functions **********/
/*
* Both "-Oppid" and "-O ppid" should be legal, though Unix98
* does not require it. BSD and Digital Unix allow both.
* Return the argument or NULL;
*/
static const char *get_opt_arg(void){
if(*(flagptr+1)){ /* argument is part of ps_argv[thisarg] */
not_pure_unix = 1;
return flagptr+1;
}
if(thisarg+2 > ps_argc) return NULL; /* there is nothing left */
/* argument follows ps_argv[thisarg] */
if(*(ps_argv[thisarg+1]) == '\0') return NULL;
return ps_argv[++thisarg];
}
/********** parse lists (of UID, tty, GID, PID...) **********/
static const char *parse_pid(char *str, sel_union *ret){
char *endp;
unsigned long num;
static const char pidrange[] = "Process ID out of range.";
static const char pidsyntax[] = "Process ID list syntax error.";
num = strtoul(str, &endp, 0);
if(*endp != '\0') return pidsyntax;
if(num<1) return pidrange;
if(num > 0x7fffffffUL) return pidrange;
ret->pid = num;
return 0;
}
static const char *parse_uid(char *str, sel_union *ret){
struct passwd *passwd_data;
char *endp;
unsigned long num;
static const char uidrange[] = "User ID out of range.";
static const char uidexist[] = "User name does not exist.";
num = strtoul(str, &endp, 0);
if(*endp != '\0'){ /* hmmm, try as login name */
passwd_data = getpwnam(str);
if(!passwd_data) return uidexist;
num = passwd_data->pw_uid;
}
if(num > 0xfffffffeUL) return uidrange;
ret->uid = num;
return 0;
}
static const char *parse_gid(char *str, sel_union *ret){
struct group *group_data;
char *endp;
unsigned long num;
static const char gidrange[] = "Group ID out of range.";
static const char gidexist[] = "Group name does not exist.";
num = strtoul(str, &endp, 0);
if(*endp != '\0'){ /* hmmm, try as login name */
group_data = getgrnam(str);
if(!group_data) return gidexist;
num = group_data->gr_gid;
}
if(num > 0xfffffffeUL) return gidrange;
ret->gid = num;
return 0;
}
static const char *parse_cmd(char *str, sel_union *ret){
strncpy(ret->cmd, str, sizeof ret->cmd); // strncpy pads to end
return 0;
}
static const char *parse_tty(char *str, sel_union *ret){
struct stat sbuf;
static const char missing[] = "TTY could not be found.";
static const char not_tty[] = "List member was not a TTY.";
char path[4096];
if(str[0]=='/'){
if(stat(str, &sbuf) >= 0) goto found_it;
return missing;
}
#define lookup(p) \
snprintf(path,4096,p,str); \
if(stat(path, &sbuf) >= 0) goto found_it
lookup("/dev/pts/%s"); /* New Unix98 ptys go first */
lookup("/dev/%s");
lookup("/dev/tty%s");
lookup("/dev/pty%s");
lookup("/dev/%snsole"); /* "co" means "console", maybe do all VCs too? */
if(!strcmp(str,"-")){ /* "-" means no tty (from AIX) */
ret->tty = 0; /* processes w/o tty */
return 0;
}
if(!strcmp(str,"?")){ /* "?" means no tty, which bash eats (Reno BSD?) */
ret->tty = 0; /* processes w/o tty */
return 0;
}
if(!*(str+1) && (stat(str,&sbuf)>=0)){ /* Kludge! Assume bash ate '?'. */
ret->tty = 0; /* processes w/o tty */
return 0;
}
#undef lookup
return missing;
found_it:
if(!S_ISCHR(sbuf.st_mode)) return not_tty;
ret->tty = sbuf.st_rdev;
return 0;
}
/*
* Used to parse lists in a generic way. (function pointers)
*/
static const char *parse_list(const char *arg, const char *(*parse_fn)(char *, sel_union *) ){
selection_node *node;
char *buf; /* temp copy of arg to hack on */
char *sep_loc; /* separator location: " \t," */
char *walk;
int items;
int need_item;
const char *err; /* error code that could or did happen */
/*** prepare to operate ***/
node = malloc(sizeof(selection_node));
node->u = malloc(strlen(arg)*sizeof(sel_union)); /* waste is insignificant */
node->n = 0;
buf = malloc(strlen(arg)+1);
strcpy(buf, arg);
/*** sanity check and count items ***/
need_item = 1; /* true */
items = 0;
walk = buf;
err = "Improper list.";
do{
switch(*walk){
case ' ': case ',': case '\t': case '\0':
if(need_item) goto parse_error;
need_item=1;
break;
default:
if(need_item) items++;
need_item=0;
}
} while (*++walk);
if(need_item) goto parse_error;
node->n = items;
/*** actually parse the list ***/
walk = buf;
while(items--){
sep_loc = strpbrk(walk," ,\t");
if(sep_loc) *sep_loc = '\0';
if(( err=(parse_fn)(walk, node->u+items) )) goto parse_error;
walk = sep_loc + 1; /* point to next item, if any */
}
free(buf);
node->next = selection_list;
selection_list = node;
return NULL;
parse_error:
free(buf);
free(node->u);
free(node);
return err;
}
/***************** parse SysV options, including Unix98 *****************/
static const char *parse_sysv_option(void){
const char *arg;
const char *err;
flagptr = ps_argv[thisarg];
while(*++flagptr){
// Find any excuse to ignore stupid Unix98 misfeatures.
//
// This list of options is ONLY for those defined by the
// "IEEE Std 1003.1, 2004 Edition", "ISO/IEC 9945:2003",
// or "Version 2 of the Single Unix Specification".
//
// It may be time to re-think the existance of this list.
// In the meantime, please do not add to it. The list is
// intended to ONLY contain flags defined by the POSIX and UNIX
// standards published by The Open Group, IEEE, and ISO.
if(!strchr("aAdefgGlnoptuU", *flagptr)) not_pure_unix = 1;
switch(*flagptr){
case 'A':
trace("-A selects all processes.\n");
all_processes = 1;
break;
case 'C': /* end */
trace("-C select by process name.\n"); /* Why only HP/UX and us? */
arg=get_opt_arg();
if(!arg) return "List of command names must follow -C.";
err=parse_list(arg, parse_cmd);
if(err) return err;
selection_list->typecode = SEL_COMM;
return NULL; /* can't have any more options */
case 'F': /* DYNIX/ptx -f plus sz,rss,psr=ENG between c and stime */
trace("-F does fuller listing\n");
format_modifiers |= FM_F;
format_flags |= FF_Uf;
unix_f_option = 1; /* does this matter? */
break;
case 'G': /* end */
trace("-G select by RGID (supports names)\n");
arg=get_opt_arg();
if(!arg) return "List of real groups must follow -G.";
err=parse_list(arg, parse_gid);
if(err) return err;
selection_list->typecode = SEL_RGID;
return NULL; /* can't have any more options */
case 'H': /* another nice HP/UX feature */
trace("-H Process hierarchy (like ASCII art forest option)\n");
forest_type = 'u';
break;
#if 0
case 'J': // specify list of job IDs in hex (IRIX) -- like HP "-R" maybe?
trace("-J select by job ID\n"); // want a JID ("jid") for "-j" too
arg=get_opt_arg();
if(!arg) return "List of jobs must follow -J.";
err=parse_list(arg, parse_jid);
if(err) return err;
selection_list->typecode = SEL_JID;
return NULL; /* can't have any more options */
#endif
case 'L': /* */
/* In spite of the insane 2-level thread system, Sun appears to
* have made this option Linux-compatible. If a process has N
* threads, ps will produce N lines of output. (not N+1 lines)
* Zombies are the only exception, with NLWP==0 and 1 output line.
* SCO UnixWare uses -L too.
*/
trace("-L Print LWP (thread) info.\n");
thread_flags |= TF_U_L;
// format_modifiers |= FM_L;
break;
case 'M': // typically the SE Linux context
trace("-M Print security label for Mandatory Access Control.\n");
format_modifiers |= FM_M;
break;
case 'N':
trace("-N negates.\n");
negate_selection = 1;
break;
case 'O': /* end */
trace("-O is preloaded -o.\n");
arg=get_opt_arg();
if(!arg) return "Format or sort specification must follow -O.";
defer_sf_option(arg, SF_U_O);
return NULL; /* can't have any more options */
case 'P': /* SunOS 5 "psr" or unknown HP/UX feature */
trace("-P adds columns of PRM info (HP-UX), PSR (SunOS), or capabilities (IRIX)\n");
format_modifiers |= FM_P;
break;
#if 0
case 'R': // unknown HP/UX feature, like IRIX "-J" maybe?
trace("-R select by PRM group\n");
arg=get_opt_arg();
if(!arg) return "List of PRM groups must follow -R.";
err=parse_list(arg, parse_prm);
if(err) return err;
selection_list->typecode = SEL_PRM;
return NULL; /* can't have any more options */
#endif
case 'T':
/* IRIX 6.5 docs suggest POSIX threads get shown individually.
* This would make -T be like -L, -m, and m. (but an extra column)
* Testing (w/ normal processes) shows 1 line/process, not 2.
* Also, testing shows PID==SPID for all normal processes.
*/
trace("-T adds strange SPID column (old sproc() threads?)\n");
thread_flags |= TF_U_T;
// format_modifiers |= FM_T;
break;
case 'U': /* end */
trace("-U select by RUID (supports names).\n");
arg=get_opt_arg();
if(!arg) return "List of real groups must follow -U.";
err=parse_list(arg, parse_uid);
if(err) return err;
selection_list->typecode = SEL_RUID;
return NULL; /* can't have any more options */
case 'V': /* single */
trace("-V prints version.\n");
exclusive("-V");
display_version();
exit(0);
// This must be verified against SVR4-MP. (UnixWare or Powermax)
// Leave it undocumented until that problem is solved.
case 'Z': /* full Mandatory Access Control level info */
trace("-Z shows full MAC info\n");
format_modifiers |= FM_M;
break;
case 'a':
trace("-a select all with a tty, but omit session leaders.\n");
simple_select |= SS_U_a;
break;
case 'c':
/* HP-UX and SunOS 5 scheduling info modifier */
trace("-c changes scheduling info.\n");
format_modifiers |= FM_c;
break;
case 'd':
trace("-d select all, but omit session leaders.\n");
simple_select |= SS_U_d;
break;
case 'e':
trace("-e selects all processes.\n");
all_processes = 1;
break;
case 'f':
trace("-f does full listing\n");
format_flags |= FF_Uf;
unix_f_option = 1; /* does this matter? */
break;
case 'g': /* end */
trace("-g selects by session leader OR by group name\n");
arg=get_opt_arg();
if(!arg) return "List of session leaders OR effective group names must follow -g.";
err=parse_list(arg, parse_pid);
if(!err){
selection_list->typecode = SEL_SESS;
return NULL; /* can't have any more options */
}
err=parse_list(arg, parse_gid);
if(!err){
selection_list->typecode = SEL_EGID;
return NULL; /* can't have any more options */
}
return "List of session leaders OR effective group IDs was invalid.";
case 'j':
trace("-j jobs format.\n");
/* old Debian used RD_j and Digital uses JFMT */
if(sysv_j_format) format_flags |= FF_Uj;
else format_modifiers |= FM_j;
break;
case 'l':
trace("-l long format.\n");
format_flags |= FF_Ul;
break;
case 'm':
trace("-m shows threads.\n");
/* note that AIX shows 2 lines for a normal process */
thread_flags |= TF_U_m;
break;
case 'n': /* end */
trace("-n sets namelist file.\n");
arg=get_opt_arg();
if(!arg) return "Alternate System.map file must follow -n.";
namelist_file = arg;
return NULL; /* can't have any more options */
case 'o': /* end */
/* Unix98 has gross behavior regarding this. From the following: */
/* ps -o pid,nice=NICE,tty=TERMINAL,comm */
/* The result must be 2 columns: "PID NICE,tty=TERMINAL,comm" */
/* Yes, the second column has the name "NICE,tty=TERMINAL,comm" */
/* This parser looks for any excuse to ignore that braindamage. */
trace("-o user-defined format.\n");
arg=get_opt_arg();
if(!arg) return "Format specification must follow -o.";
not_pure_unix |= defer_sf_option(arg, SF_U_o);
return NULL; /* can't have any more options */
case 'p': /* end */
trace("-p select by PID.\n");
arg=get_opt_arg();
if(!arg) return "List of process IDs must follow -p.";
err=parse_list(arg, parse_pid);
if(err) return err;
selection_list->typecode = SEL_PID;
return NULL; /* can't have any more options */
#if 0
case 'r':
trace("-r some Digital Unix thing about warnings...\n");
trace(" or SCO's option to chroot() for new /proc and /dev.\n");
return "The -r option is reserved.";
break;
#endif
case 's': /* end */
trace("-s Select processes belonging to the sessions given.\n");
arg=get_opt_arg();
if(!arg) return "List of session IDs must follow -s.";
err=parse_list(arg, parse_pid);
if(err) return err;
selection_list->typecode = SEL_SESS;
return NULL; /* can't have any more options */
case 't': /* end */
trace("-t select by tty.\n");
arg=get_opt_arg();
if(!arg) return "List of terminals (pty, tty...) must follow -t.";
err=parse_list(arg, parse_tty);
if(err) return err;
selection_list->typecode = SEL_TTY;
return NULL; /* can't have any more options */
case 'u': /* end */
trace("-u select by user ID (the EUID?) (supports names).\n");
arg=get_opt_arg();
if(!arg) return "List of users must follow -u.";
err=parse_list(arg, parse_uid);
if(err) return err;
selection_list->typecode = SEL_EUID;
return NULL; /* can't have any more options */
case 'w':
trace("-w wide output.\n");
w_count++;
break;
case 'x': /* behind personality until "ps -ax" habit is uncommon */
if(personality & PER_SVR4_x){
// Same as -y, but for System V Release 4 MP
trace("-x works like Sun Solaris & SCO Unixware -y option\n");
format_modifiers |= FM_y;
break;
}
if(personality & PER_HPUX_x){
trace("-x extends the command line\n");
w_count += 2;
unix_f_option = 1;
break;
}
return "Must set personality to get -x option.";
case 'y': /* Sun's -l hack (also: Irix "lnode" resource control info) */
trace("-y Print lnone info in UID/USER column or do Sun -l hack.\n");
format_modifiers |= FM_y;
break;
#if 0
// This must be verified against SVR4-MP (UnixWare or Powermax)
case 'z': /* alias of Mandatory Access Control level info */
trace("-z shows aliased MAC info\n");
format_modifiers |= FM_M;
break;
// Solaris 10 does this
case 'z': /* select by zone */
trace("-z secects by zone\n");
arg=get_opt_arg();
if(!arg) return "List of zones (contexts, labels, whatever?) must follow -z.";
err=parse_list(arg, parse_zone);
if(err) return err;
selection_list->typecode = SEL_ZONE;
return NULL; /* can't have any more options */
#endif
case '-':
return "Embedded '-' among SysV options makes no sense.";
break;
case '\0':
return "Please report the \"SysV \\0 can't happen\" bug.";
break;
default:
return "Unsupported SysV option.";
} /* switch */
} /* while */
return NULL;
}
/************************* parse BSD options **********************/
static const char *parse_bsd_option(void){
const char *arg;
const char *err;
flagptr = ps_argv[thisarg]; /* assume we _have_ a '-' */
if(flagptr[0]=='-'){
if(!force_bsd) return "Can't happen! Problem #1.";
}else{
flagptr--; /* off beginning, will increment before use */
if(personality & PER_FORCE_BSD){
if(!force_bsd) return "Can't happen! Problem #2.";
}else{
if(force_bsd) return "2nd chance parse failed, not BSD or SysV.";
}
}
while(*++flagptr){
switch(*flagptr){
case '0' ... '9': /* end */
trace("0..9 Old BSD-style select by process ID\n");
arg=flagptr;
err=parse_list(arg, parse_pid);
if(err) return err;
selection_list->typecode = SEL_PID;
return NULL; /* can't have any more options */
#if 0
case 'A':
/* maybe this just does a larger malloc() ? */
trace("A Increases the argument space (Digital Unix)\n");
return "Option A is reserved.";
break;
case 'C':
/* should divide result by 1-(e**(foo*log(bar))) */
trace("C Use raw CPU time for %%CPU instead of decaying ave\n");
return "Option C is reserved.";
break;
#endif
case 'H': // The FreeBSD way (NetBSD:s OpenBSD:k FreeBSD:H -- NIH???)
trace("H Print LWP (thread) info.\n"); // was: Use /vmcore as c-dumpfile\n");
thread_flags |= TF_B_H;
//format_modifiers |= FM_L; // FIXME: determine if we need something like this
break;
case 'L': /* single */
trace("L List all format specifiers\n");
exclusive("L");
print_format_specifiers();
exit(0);
case 'M': // undocumented for now: these are proliferating!
trace("M MacOS X thread display, like AIX/Tru64\n");
thread_flags |= TF_B_m;
break;
case 'N': /* end */
trace("N Specify namelist file\n");
arg=get_opt_arg();
if(!arg) return "Alternate System.map file must follow N.";
namelist_file = arg;
return NULL; /* can't have any more options */
case 'O': /* end */
trace("O Like o + defaults, add new columns after PID. Also sort.\n");
arg=get_opt_arg();
if(!arg) return "Format or sort specification must follow O.";
defer_sf_option(arg, SF_B_O);
return NULL; /* can't have any more options */
break;
case 'S':
trace("S include dead kids in sum\n");
include_dead_children = 1;
break;
case 'T':
trace("T Select all processes on this terminal\n");
/* put our tty on a tiny list */
{
selection_node *node;
node = malloc(sizeof(selection_node));
node->u = malloc(sizeof(sel_union));
node->u[0].tty = cached_tty;
node->typecode = SEL_TTY;
node->n = 1;
node->next = selection_list;
selection_list = node;
}
break;
case 'U': /* end */
trace("U Select processes for specified users.\n");
arg=get_opt_arg();
if(!arg) return "List of users must follow U.";
err=parse_list(arg, parse_uid);
if(err) return err;
selection_list->typecode = SEL_EUID;
return NULL; /* can't have any more options */
case 'V': /* single */
trace("V show version info\n");
exclusive("V");
display_version();
exit(0);
case 'W':
trace("W N/A get swap info from ... not /dev/drum.\n");
return "Obsolete W option not supported. (You have a /dev/drum?)";
break;
case 'X':
trace("X Old Linux i386 register format\n");
format_flags |= FF_LX;
break;
case 'Z': /* FreeBSD does MAC like SGI's Irix does it */
trace("Z Print security label for Mandatory Access Control.\n");
format_modifiers |= FM_M;
break;
case 'a':
trace("a Select all w/tty, including other users\n");
simple_select |= SS_B_a;
break;
case 'c':
trace("c true command name\n");
bsd_c_option = 1;
break;
case 'e':
trace("e environment\n");
bsd_e_option = 1;
break;
case 'f':
trace("f ASCII art forest\n");
forest_type = 'b';
break;
case 'g':
trace("g _all_, even group leaders!.\n");
simple_select |= SS_B_g;
break;
case 'h':
trace("h Repeat header... yow.\n");
if(header_type) return "Only one heading option may be specified.";
if(personality & PER_BSD_h) header_type = HEAD_MULTI;
else header_type = HEAD_NONE;
break;
case 'j':
trace("j job control format\n");
format_flags |= FF_Bj;
break;
case 'k':
// OpenBSD: don't hide "kernel threads" -- like the swapper?
// trace("k Print LWP (thread) info.\n"); // was: Use /vmcore as c-dumpfile\n");
// NetBSD, and soon (?) FreeBSD: sort-by-keyword
trace("k Specify sorting keywords.\n");
arg=get_opt_arg();
if(!arg) return "Long sort specification must follow 'k'.";
defer_sf_option(arg, SF_G_sort);
return NULL; /* can't have any more options */
case 'l':
trace("l Display long format\n");
format_flags |= FF_Bl;
break;
case 'm':
trace("m all threads, sort on mem use, show mem info\n");
if(personality & PER_OLD_m){
format_flags |= FF_Lm;
break;
}
if(personality & PER_BSD_m){
defer_sf_option("pmem", SF_B_m);
break;
}
thread_flags |= TF_B_m;
break;
case 'n':
trace("n Numeric output for WCHAN, and USER replaced by UID\n");
wchan_is_number = 1;
user_is_number = 1;
/* TODO add tty_is_number too? */
break;
case 'o': /* end */
trace("o Specify user-defined format\n");
arg=get_opt_arg();
if(!arg) return "Format specification must follow o.";
defer_sf_option(arg, SF_B_o);
return NULL; /* can't have any more options */
case 'p': /* end */
trace("p Select by process ID\n");
arg=get_opt_arg();
if(!arg) return "List of process IDs must follow p.";
err=parse_list(arg, parse_pid);
if(err) return err;
selection_list->typecode = SEL_PID;
return NULL; /* can't have any more options */
case 'r':
trace("r Select running processes\n");
running_only = 1;
break;
case 's':
trace("s Display signal format\n");
format_flags |= FF_Bs;
break;
case 't': /* end */
trace("t Select by tty.\n");
/* List of terminals (tty, pty...) _should_ follow t. */
arg=get_opt_arg();
if(!arg){
/* Wow, obsolete BSD syntax. Put our tty on a tiny list. */
selection_node *node;
node = malloc(sizeof(selection_node));
node->u = malloc(sizeof(sel_union));
node->u[0].tty = cached_tty;
node->typecode = SEL_TTY;
node->n = 1;
node->next = selection_list;
selection_list = node;
return NULL;
}
err=parse_list(arg, parse_tty);
if(err) return err;
selection_list->typecode = SEL_TTY;
return NULL; /* can't have any more options */
case 'u':
trace("u Display user-oriented\n");
format_flags |= FF_Bu;
break;
case 'v':
trace("v Display virtual memory\n");
format_flags |= FF_Bv;
break;
case 'w':
trace("w wide output\n");
w_count++;
break;
case 'x':
trace("x Select processes without controlling ttys\n");
simple_select |= SS_B_x;
break;
#if 0
case 'y':
// DragonFlyBSD iac (interactivity measure) format
// uid,pid,ppid,cpu,pri,iac,nice,wchan,state,tt,time,command
// (they use 'Y' to sort by this "iac" thing; 'y' implies 'Y')
// Range is -127 .. 127, with lower numbers being more
// interactive and higher numbers more batch-like.
trace("y Display interactivity measure\n");
format_flags |= FF_Bv;
break;
#endif
case '-':
return "Embedded '-' among BSD options makes no sense.";
break;
case '\0':
return "Please report the \"BSD \\0 can't happen\" bug.";
break;
default:
return "Unsupported option (BSD syntax)";
} /* switch */
} /* while */
return NULL;
}
/*************** gnu long options **********************/
/*
* Return the argument or NULL
*/
static const char *grab_gnu_arg(void){
switch(*flagptr){ /* argument is part of ps_argv[thisarg] */
default:
return NULL; /* something bad */
case '=': case ':':
if(*++flagptr) return flagptr; /* found it */
return NULL; /* empty '=' or ':' */
case '\0': /* try next argv[] */
;
}
if(thisarg+2 > ps_argc) return NULL; /* there is nothing left */
/* argument follows ps_argv[thisarg] */
if(*(ps_argv[thisarg+1]) == '\0') return NULL;
return ps_argv[++thisarg];
}
typedef struct gnu_table_struct {
const char *name; /* long option name */
const void *jump; /* See gcc extension info. :-) */
} gnu_table_struct;
static int compare_gnu_table_structs(const void *a, const void *b){
return strcmp(((const gnu_table_struct*)a)->name,((const gnu_table_struct*)b)->name);
}
/* Option arguments are after ':', after '=', or in argv[n+1] */
static const char *parse_gnu_option(void){
const char *arg;
const char *err;
char *s;
size_t sl;
char buf[16];
gnu_table_struct findme = { buf, NULL};
gnu_table_struct *found;
static const gnu_table_struct gnu_table[] = {
{"Group", &&case_Group}, /* rgid */
{"User", &&case_User}, /* ruid */
{"cols", &&case_cols},
{"columns", &&case_columns},
{"context", &&case_context},
{"cumulative", &&case_cumulative},
{"deselect", &&case_deselect}, /* -N */
{"forest", &&case_forest}, /* f -H */
{"format", &&case_format},
{"group", &&case_group}, /* egid */
{"header", &&case_header},
{"headers", &&case_headers},
{"heading", &&case_heading},
{"headings", &&case_headings},
{"help", &&case_help},
{"info", &&case_info},
{"lines", &&case_lines},
{"no-header", &&case_no_header},
{"no-headers", &&case_no_headers},
{"no-heading", &&case_no_heading},
{"no-headings", &&case_no_headings},
{"noheader", &&case_noheader},
{"noheaders", &&case_noheaders},
{"noheading", &&case_noheading},
{"noheadings", &&case_noheadings},
{"pid", &&case_pid},
{"ppid", &&case_ppid},
{"rows", &&case_rows},
{"sid", &&case_sid},
{"sort", &&case_sort},
{"tty", &&case_tty},
{"user", &&case_user}, /* euid */
{"version", &&case_version},
{"width", &&case_width},
};
const int gnu_table_count = sizeof(gnu_table)/sizeof(gnu_table_struct);
s = ps_argv[thisarg]+2;
sl = strcspn(s,":=");
if(sl > 15) return "Unknown gnu long option.";
strncpy(buf, s, sl);
buf[sl] = '\0';
flagptr = s+sl;
found = bsearch(&findme, gnu_table, gnu_table_count,
sizeof(gnu_table_struct), compare_gnu_table_structs
);
if(!found) return "Unknown gnu long option.";
goto *(found->jump); /* See gcc extension info. :-) */
case_Group:
trace("--Group\n");
arg = grab_gnu_arg();
if(!arg) return "List of real groups must follow --Group.";
err=parse_list(arg, parse_gid);
if(err) return err;
selection_list->typecode = SEL_RGID;
return NULL;
case_User:
trace("--User\n");
arg = grab_gnu_arg();
if(!arg) return "List of real users must follow --User.";
err=parse_list(arg, parse_uid);
if(err) return err;
selection_list->typecode = SEL_RUID;
return NULL;
case_cols:
case_width:
case_columns:
trace("--cols\n");
arg = grab_gnu_arg();
if(arg && *arg){
long t;
char *endptr;
t = strtol(arg, &endptr, 0);
if(!*endptr && (t>0) && (t<2000000000)){
screen_cols = (int)t;
return NULL;
}
}
return "Number of columns must follow --cols, --width, or --columns.";
case_cumulative:
trace("--cumulative\n");
if(s[sl]) return "Option --cumulative does not take an argument.";
include_dead_children = 1;
return NULL;
case_deselect:
trace("--deselect\n");
if(s[sl]) return "Option --deselect does not take an argument.";
negate_selection = 1;
return NULL;
case_no_header:
case_no_headers:
case_no_heading:
case_no_headings:
case_noheader:
case_noheaders:
case_noheading:
case_noheadings:
trace("--noheaders\n");
if(s[sl]) return "Option --no-heading does not take an argument.";
if(header_type) return "Only one heading option may be specified.";
header_type = HEAD_NONE;
return NULL;
case_header:
case_headers:
case_heading:
case_headings:
trace("--headers\n");
if(s[sl]) return "Option --heading does not take an argument.";
if(header_type) return "Only one heading option may be specified.";
header_type = HEAD_MULTI;
return NULL;
case_forest:
trace("--forest\n");
if(s[sl]) return "Option --forest does not take an argument.";
forest_type = 'g';
return NULL;
case_format:
trace("--format\n");
arg=grab_gnu_arg();
if(!arg) return "Format specification must follow --format.";
defer_sf_option(arg, SF_G_format);
return NULL;
case_group:
trace("--group\n");
arg = grab_gnu_arg();
if(!arg) return "List of effective groups must follow --group.";
err=parse_list(arg, parse_gid);
if(err) return err;
selection_list->typecode = SEL_EGID;
return NULL;
case_help:
trace("--help\n");
exclusive("--help");
fwrite(help_message,1,strlen(help_message),stdout);
exit(0);
return NULL;
case_info:
trace("--info\n");
exclusive("--info");
self_info();
exit(0);
return NULL;
case_pid:
trace("--pid\n");
arg = grab_gnu_arg();
if(!arg) return "List of process IDs must follow --pid.";
err=parse_list(arg, parse_pid);
if(err) return err;
selection_list->typecode = SEL_PID;
return NULL;
case_ppid:
trace("--ppid\n");
arg = grab_gnu_arg();
if(!arg) return "List of process IDs must follow --ppid.";
err=parse_list(arg, parse_pid);
if(err) return err;
selection_list->typecode = SEL_PPID;
return NULL;
case_rows:
case_lines:
trace("--rows\n");
arg = grab_gnu_arg();
if(arg && *arg){
long t;
char *endptr;
t = strtol(arg, &endptr, 0);
if(!*endptr && (t>0) && (t<2000000000)){
screen_rows = (int)t;
return NULL;
}
}
return "Number of rows must follow --rows or --lines.";
case_sid:
trace("--sid\n");
arg = grab_gnu_arg();
if(!arg) return "Some sid thing(s) must follow --sid.";
err=parse_list(arg, parse_pid);
if(err) return err;
selection_list->typecode = SEL_SESS;
return NULL;
case_sort:
trace("--sort\n");
arg=grab_gnu_arg();
if(!arg) return "Long sort specification must follow --sort.";
defer_sf_option(arg, SF_G_sort);
return NULL;
case_tty:
trace("--tty\n");
arg = grab_gnu_arg();
if(!arg) return "List of ttys must follow --tty.";
err=parse_list(arg, parse_tty);
if(err) return err;
selection_list->typecode = SEL_TTY;
return NULL;
case_user:
trace("--user\n");
arg = grab_gnu_arg();
if(!arg) return "List of effective users must follow --user.";
err=parse_list(arg, parse_uid);
if(err) return err;
selection_list->typecode = SEL_EUID;
return NULL;
case_version:
trace("--version\n");
exclusive("--version");
display_version();
exit(0);
return NULL;
case_context:
trace("--context\n");
format_flags |= FF_Fc;
return NULL;
}
/*************** process trailing PIDs **********************/
static const char *parse_trailing_pids(void){
selection_node *pidnode; /* pid */
selection_node *grpnode; /* process group */
selection_node *sidnode; /* session */
char **argp; /* pointer to pointer to text of PID */
const char *err; /* error code that could or did happen */
int i;
i = ps_argc - thisarg; /* how many trailing PIDs, SIDs, PGRPs?? */
argp = ps_argv + thisarg;
thisarg = ps_argc - 1; /* we must be at the end now */
pidnode = malloc(sizeof(selection_node));
pidnode->u = malloc(i*sizeof(sel_union)); /* waste is insignificant */
pidnode->n = 0;
grpnode = malloc(sizeof(selection_node));
grpnode->u = malloc(i*sizeof(sel_union)); /* waste is insignificant */
grpnode->n = 0;
sidnode = malloc(sizeof(selection_node));
sidnode->u = malloc(i*sizeof(sel_union)); /* waste is insignificant */
sidnode->n = 0;
while(i--){
char *data;
data = *(argp++);
switch(*data){
default: err = parse_pid( data, pidnode->u + pidnode->n++); break;
case '-': err = parse_pid(++data, grpnode->u + grpnode->n++); break;
case '+': err = parse_pid(++data, sidnode->u + sidnode->n++); break;
}
if(err) return err; /* the node gets freed with the list */
}
if(pidnode->n){
pidnode->next = selection_list;
selection_list = pidnode;
selection_list->typecode = SEL_PID;
} /* else free both parts */
if(grpnode->n){
grpnode->next = selection_list;
selection_list = grpnode;
selection_list->typecode = SEL_PGRP;
} /* else free both parts */
if(sidnode->n){
sidnode->next = selection_list;
selection_list = sidnode;
selection_list->typecode = SEL_SESS;
} /* else free both parts */
return NULL;
}
/************** misc stuff ***********/
static void reset_parser(void){
w_count = 0;
}
static int arg_type(const char *str){
int tmp = str[0];
if((tmp>='a') && (tmp<='z')) return ARG_BSD;
if((tmp>='A') && (tmp<='Z')) return ARG_BSD;
if((tmp>='0') && (tmp<='9')) return ARG_PID;
if(tmp=='+') return ARG_SESS;
if(tmp!='-') return ARG_FAIL;
tmp = str[1];
if((tmp>='a') && (tmp<='z')) return ARG_SYSV;
if((tmp>='A') && (tmp<='Z')) return ARG_SYSV;
if((tmp>='0') && (tmp<='9')) return ARG_PGRP;
if(tmp!='-') return ARG_FAIL;
tmp = str[2];
if((tmp>='a') && (tmp<='z')) return ARG_GNU;
if((tmp>='A') && (tmp<='Z')) return ARG_GNU;
if(tmp=='\0') return ARG_END;
return ARG_FAIL;
}
/* First assume sysv, because that is the POSIX and Unix98 standard. */
static const char *parse_all_options(void){
const char *err = NULL;
int at;
while(++thisarg < ps_argc){
trace("parse_all_options calling arg_type for \"%s\"\n", ps_argv[thisarg]);
at = arg_type(ps_argv[thisarg]);
trace("ps_argv[thisarg] is %s\n", ps_argv[thisarg]);
if(at != ARG_SYSV) not_pure_unix = 1;
switch(at){
case ARG_GNU:
err = parse_gnu_option();
break;
case ARG_SYSV:
if(!force_bsd){ /* else go past case ARG_BSD */
err = parse_sysv_option();
break;
case ARG_BSD:
if(force_bsd && !(personality & PER_FORCE_BSD)) return "way bad";
}
prefer_bsd_defaults = 1;
err = parse_bsd_option();
break;
case ARG_PGRP:
case ARG_SESS:
case ARG_PID:
prefer_bsd_defaults = 1;
err = parse_trailing_pids();
break;
case ARG_END:
case ARG_FAIL:
trace(" FAIL/END on [%s]\n",ps_argv[thisarg]);
return "Garbage option.";
break;
default:
printf(" ? %s\n",ps_argv[thisarg]);
return "Something broke.";
} /* switch */
if(err) return err;
} /* while */
return NULL;
}
static void choose_dimensions(void){
if(w_count && (screen_cols<132)) screen_cols=132;
if(w_count>1) screen_cols=OUTBUF_SIZE;
/* perhaps --html and --null should set unlimited width */
}
static const char *thread_option_check(void){
if(!thread_flags){
thread_flags = TF_show_proc;
return NULL;
}
if(forest_type){
return "Thread display conflicts with forest display.";
}
//thread_flags |= TF_no_forest;
if((thread_flags&TF_B_H) && (thread_flags&(TF_B_m|TF_U_m)))
return "Thread flags conflict; can't use H with m or -m.";
if((thread_flags&TF_B_m) && (thread_flags&TF_U_m))
return "Thread flags conflict; can't use both m and -m.";
if((thread_flags&TF_U_L) && (thread_flags&TF_U_T))
return "Thread flags conflict; can't use both -L and -T.";
if(thread_flags&TF_B_H) thread_flags |= (TF_show_proc|TF_loose_tasks);
if(thread_flags&(TF_B_m|TF_U_m)) thread_flags |= (TF_show_proc|TF_show_task|TF_show_both);
if(thread_flags&(TF_U_T|TF_U_L)){
if(thread_flags&(TF_B_m|TF_U_m|TF_B_H)){
// Got a thread style, so format modification is a requirement?
// Maybe -T/-L has H thread style though. (sorting interaction?)
//return "Huh? Tell procps-feedback@lists.sf.net what you expected.";
thread_flags |= TF_must_use;
}else{
// using -L/-T thread style, so format from elsewhere is OK
thread_flags |= TF_show_task; // or like the H option?
//thread_flags |= TF_no_sort;
}
}
return NULL;
}
int arg_parse(int argc, char *argv[]){
const char *err = NULL;
const char *err2 = NULL;
ps_argc = argc;
ps_argv = argv;
thisarg = 0;
if(personality & PER_FORCE_BSD) goto try_bsd;
err = parse_all_options();
if(err) goto try_bsd;
err = thread_option_check();
if(err) goto try_bsd;
err = process_sf_options(!not_pure_unix);
if(err) goto try_bsd;
err = select_bits_setup();
if(err) goto try_bsd;
choose_dimensions();
return 0;
try_bsd:
trace("--------- now try BSD ------\n");
reset_global();
reset_parser();
reset_sortformat();
format_flags = 0;
ps_argc = argc;
ps_argv = argv;
thisarg = 0;
/* no need to reset flagptr */
not_pure_unix=1;
force_bsd=1;
prefer_bsd_defaults=1;
if(!( (PER_OLD_m|PER_BSD_m) & personality )) /* if default m setting... */
personality |= PER_OLD_m; /* Prefer old Linux over true BSD. */
/* Do not set PER_FORCE_BSD! It is tested below. */
err2 = parse_all_options();
if(err2) goto total_failure;
err2 = thread_option_check();
if(err2) goto total_failure;
err2 = process_sf_options(!not_pure_unix);
if(err2) goto total_failure;
err2 = select_bits_setup();
if(err2) goto total_failure;
// Feel a need to patch this out? First of all, read the FAQ.
// Second of all, talk to me. Without this warning, people can
// get seriously confused. Ask yourself if users would freak out
// about "ps -aux" suddenly changing behavior if a user "x" were
// added to the system.
//
// Also, a "-x" option is coming. It's already there in fact,
// for some non-default personalities. So "ps -ax" will parse
// as SysV options... and you're screwed if you've been patching
// out the friendly warning. Cut-over is likely to be in 2005.
if(!(personality & PER_FORCE_BSD))
fprintf(stderr, "Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html\n");
// Remember: contact albert@users.sf.net or procps-feedback@lists.sf.net
// if you should feel tempted. Be damn sure you understand all
// the issues. The same goes for other stuff too, BTW. Please ask.
// I'm happy to justify various implementation choices.
choose_dimensions();
return 0;
total_failure:
reset_parser();
if(personality & PER_FORCE_BSD) fprintf(stderr, "ERROR: %s\n", err2);
else fprintf(stderr, "ERROR: %s\n", err);
fwrite(help_message,1,strlen(help_message),stderr);
exit(1);
/* return 1; */ /* useless */
}
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