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fstabinfo: replace vfork with posix_spawnp 

problem:
* vfork has been removed from POSIX [0].
* clang-tidy flags the `strerror` and `eerror` call inside the vfork-ed
  child as undefined behavior.

solution: use posix_spawnp, which is serves similar purpose and is
specified in posix. and as an added bonus, it's also easier to use and
less lines of code.

[0]: https://www.man7.org/linux/man-pages/man2/vfork.2.html#CONFORMING_TO
This commit is contained in:
NRK 2023-01-31 05:23:33 +06:00 committed by William Hubbs
parent 8f52c64c37
commit 5f04dcc951
1 changed files with 12 additions and 18 deletions
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30
src/fstabinfo/fstabinfo.c
View File

@ -23,6 +23,7 @@
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <spawn.h>
/* Yay for linux and its non liking of POSIX functions.
Okay, we could use getfsent but the man page says use getmntent instead
@ -63,6 +64,8 @@
#include "_usage.h"
#include "helpers.h"
extern char **environ;
const char *applet = NULL;
const char *extraopts = NULL;
const char getoptstring[] = "MRbmop:t:" getoptstring_COMMON;
@ -112,7 +115,7 @@ do_mount(struct ENT *ent, bool remount)
{
char *argv[10];
pid_t pid;
int status;
int status, err;
argv[0] = UNCONST("mount");
argv[1] = UNCONST("-o");
@ -137,23 +140,14 @@ do_mount(struct ENT *ent, bool remount)
argv[8] = NULL;
#endif
}
switch (pid = vfork()) {
case -1:
eerrorx("%s: vfork: %s", applet, strerror(errno));
/* NOTREACHED */
case 0:
execvp(argv[0], argv);
eerror("%s: execvp: %s", applet, strerror(errno));
_exit(EXIT_FAILURE);
/* NOTREACHED */
default:
waitpid(pid, &status, 0);
if (WIFEXITED(status))
return WEXITSTATUS(status);
else
return -1;
/* NOTREACHED */
}
err = posix_spawnp(&pid, argv[0], NULL, NULL, argv, environ);
if (err)
eerrorx("%s: posix_spawnp: %s", applet, strerror(err));
waitpid(pid, &status, 0);
if (WIFEXITED(status))
return WEXITSTATUS(status);
else
return -1;
}
#define OUTPUT_FILE (1 << 1)