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top,ps: improve /proc/PID/cmdinfo reading code

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function                                             old     new   delta
display_status                                         -    1231   +1231
read_cmdline                                           -     101    +101
parse_conf                                          1284    1303     +19
arith                                               2033    2042      +9
collect_blk                                          467     474      +7
fsck_main                                           1909    1911      +2
dhcprelay_main                                      1125    1122      -3
singlemount                                         4555    4547      -8
read_close                                            50      36     -14
get_lcm                                              123     105     -18
ed_main                                             3111    3084     -27
func_args                                             73      28     -45
procps_scan                                          732     658     -74
top_main                                            2187     899   -1288
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 4/8 up/down: 1369/-1477)       Total: -108 bytes
   text    data     bss     dec     hex filename
 676048    2744   13968  692760   a9218 busybox_old
 675940    2744   13968  692652   a91ac busybox_unstripped
This commit is contained in:
Denis Vlasenko
2007-06-30 14:47:41 +00:00
parent 8b1409896d
commit 98ebab8b76
5 changed files with 80 additions and 59 deletions
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13
include/libbb.h
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@ -836,7 +836,7 @@ enum { COMM_LEN = 16 };
typedef struct {
DIR *dir;
/* Fields are set to 0/NULL if failed to determine (or not requested) */
char *cmd;
/*char *cmd;*/
char *argv0;
/*char *exe;*/
USE_SELINUX(char *context;)
@ -852,7 +852,9 @@ typedef struct {
unsigned gid;
unsigned tty_major,tty_minor;
char state[4];
/* basename of executable in exec(2), read from /proc/N/stat */
/* basename of executable in exec(2), read from /proc/N/stat
* (if executable is symlink or script, it is NOT replaced
* by link target or interpreter name) */
char comm[COMM_LEN];
/* user/group? - use passwd/group parsing functions */
} procps_status_t;
@ -863,9 +865,9 @@ enum {
PSSCAN_SID = 1 << 3,
PSSCAN_UIDGID = 1 << 4,
PSSCAN_COMM = 1 << 5,
PSSCAN_CMD = 1 << 6,
/* PSSCAN_CMD = 1 << 6, - use read_cmdline instead */
PSSCAN_ARGV0 = 1 << 7,
PSSCAN_EXE = 1 << 8, /* not implemented yet */
/* PSSCAN_EXE = 1 << 8, - not implemented */
PSSCAN_STATE = 1 << 9,
PSSCAN_VSZ = 1 << 10,
PSSCAN_RSS = 1 << 11,
@ -883,6 +885,9 @@ enum {
procps_status_t* alloc_procps_scan(int flags);
void free_procps_scan(procps_status_t* sp);
procps_status_t* procps_scan(procps_status_t* sp, int flags);
/* Format cmdline (up to col chars) into char buf[col+1] */
/* Puts [comm] if cmdline is empty (-> process is a kernel thread) */
void read_cmdline(char *buf, int col, unsigned pid, const char *comm);
pid_t *find_pid_by_name(const char* procName);
pid_t *pidlist_reverse(pid_t *pidList);