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Remove the dependency on procfs. Use sysctl KERN_PROC_PATHNAME and

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KERN_PROC_PID to obtain the parent process pathname and command, used
to determine the calling shell.

Submitted by:	Stefan Neudorf
PR:	bin/183484
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2013-10-31 09:29:37 +00:00
parent 35a2489852
commit d2812536e8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=257430
1 changed files with 20 additions and 14 deletions
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34
usr.bin/limits/limits.c
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@ -30,6 +30,7 @@ __FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <sys/param.h>
#include <stdlib.h>
#include <unistd.h>
@ -705,27 +706,32 @@ getshelltype(void)
pid_t ppid = getppid();
if (ppid != 1) {
FILE * fp;
struct kinfo_proc kp;
struct stat st;
char procdir[MAXPATHLEN], buf[128];
int l = sprintf(procdir, "/proc/%ld/", (long)ppid);
char path[MAXPATHLEN];
char * shell = getenv("SHELL");
int mib[4];
size_t len;
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[3] = ppid;
if (shell != NULL && stat(shell, &st) != -1) {
struct stat st1;
strcpy(procdir+l, "file");
/* $SHELL is actual shell? */
if (stat(procdir, &st1) != -1 && memcmp(&st, &st1, sizeof st) == 0)
return getshellbyname(shell);
}
strcpy(procdir+l, "status");
if (stat(procdir, &st) == 0 && (fp = fopen(procdir, "r")) != NULL) {
char * p = fgets(buf, sizeof buf, fp)==NULL ? NULL : strtok(buf, " \t");
fclose(fp);
if (p != NULL)
return getshellbyname(p);
mib[2] = KERN_PROC_PATHNAME;
len = sizeof(path);
if (sysctl(mib, 4, path, &len, NULL, 0) != -1) {
/* $SHELL is actual shell? */
if (stat(path, &st1) != -1 && memcmp(&st, &st1, sizeof st) == 0)
return getshellbyname(shell);
}
}
mib[2] = KERN_PROC_PID;
len = sizeof(kp);
if (sysctl(mib, 4, &kp, &len, NULL, 0) != -1)
return getshellbyname(kp.ki_comm);
}
return SH_SH;
}