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authorDenis Vlasenko2007-06-30 14:47:41 +0000
committerDenis Vlasenko2007-06-30 14:47:41 +0000
commit98ebab8b768d4651d8db2f46a0cd6bd53012c8e6 (patch)
tree2f491e67f1f49a31b0cfeeaabb032b646b8d808c /libbb
parent8b1409896d3224fec477bc372c4dceaebe6d6351 (diff)
downloadbusybox-98ebab8b768d4651d8db2f46a0cd6bd53012c8e6.zip
busybox-98ebab8b768d4651d8db2f46a0cd6bd53012c8e6.tar.gz
top,ps: improve /proc/PID/cmdinfo reading code
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
Diffstat (limited to 'libbb')
-rw-r--r--libbb/procps.c35
-rw-r--r--libbb/read.c6
2 files changed, 37 insertions, 4 deletions
diff --git a/libbb/procps.c b/libbb/procps.c
index 8413ce8..1987e98 100644
--- a/libbb/procps.c
+++ b/libbb/procps.c
@@ -102,7 +102,7 @@ procps_status_t *alloc_procps_scan(int flags)
void free_procps_scan(procps_status_t* sp)
{
closedir(sp->dir);
- free(sp->cmd);
+ free(sp->argv0);
USE_SELINUX(free(sp->context);)
free(sp);
}
@@ -266,6 +266,7 @@ procps_status_t *procps_scan(procps_status_t* sp, int flags)
}
+#if 0 /* PSSCAN_CMD is not used */
if (flags & (PSSCAN_CMD|PSSCAN_ARGV0)) {
if (sp->argv0) {
free(sp->argv0);
@@ -292,10 +293,42 @@ procps_status_t *procps_scan(procps_status_t* sp, int flags)
sp->cmd = xstrdup(buf);
}
}
+#else
+ if (flags & PSSCAN_ARGV0) {
+ if (sp->argv0) {
+ free(sp->argv0);
+ sp->argv0 = NULL;
+ }
+ strcpy(filename_tail, "/cmdline");
+ n = read_to_buf(filename, buf);
+ if (n <= 0)
+ break;
+ if (flags & PSSCAN_ARGV0)
+ sp->argv0 = xstrdup(buf);
+ }
+#endif
break;
}
return sp;
}
+
+void read_cmdline(char *buf, int col, unsigned pid, const char *comm)
+{
+ ssize_t sz;
+ char filename[sizeof("/proc//cmdline") + sizeof(int)*3];
+
+ sprintf(filename, "/proc/%u/cmdline", pid);
+ sz = open_read_close(filename, buf, col);
+ if (sz > 0) {
+ buf[sz] = '\0';
+ while (--sz >= 0)
+ if ((unsigned char)(buf[sz]) < ' ')
+ buf[sz] = ' ';
+ } else {
+ snprintf(buf, col, "[%s]", comm);
+ }
+}
+
/* from kernel:
// pid comm S ppid pgid sid tty_nr tty_pgrp flg
sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
diff --git a/libbb/read.c b/libbb/read.c
index 05bf754..502d407 100644
--- a/libbb/read.c
+++ b/libbb/read.c
@@ -124,11 +124,11 @@ char *xmalloc_reads(int fd, char *buf)
ssize_t read_close(int fd, void *buf, size_t size)
{
- int e;
+ /*int e;*/
size = full_read(fd, buf, size);
- e = errno;
+ /*e = errno;*/
close(fd);
- errno = e;
+ /*errno = e;*/
return size;
}