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When RUNning a command (REM RUN ...) arrange for command's stdin to be connected to /dev/null

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This commit is contained in:
Dianne Skoll
2025-10-07 14:12:39 -04:00
parent 96c15ef42a
commit 44dd57e6e3
1 changed files with 23 additions and 3 deletions
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26
src/utils.c
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@@ -18,6 +18,7 @@ static char const DontEscapeMe[] =
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
@@ -32,10 +33,29 @@ static char const DontEscapeMe[] =
#include "protos.h"
/* Call this instead of system() so if called ignores return code,
we don't get a compiler warning */
we don't get a compiler warning. Also redirect stdin to /dev/null */
int system1(char const *cmd)
{
return system(cmd);
int stdin_dup = dup(STDIN_FILENO);
int devnull = -1;
int r;
if (stdin_dup >= 0) {
devnull = open("/dev/null", O_RDONLY);
if (devnull >= 0) {
if (dup2(devnull, STDIN_FILENO) >= 0) {
set_cloexec(stdin_dup);
}
(void) close(devnull);
}
}
r = system(cmd);
if (stdin_dup >= 0) {
(void) dup2(stdin_dup, STDIN_FILENO);
(void) close(stdin_dup);
}
return r;
}
/***************************************************************/
@@ -64,7 +84,7 @@ int system_to_stderr(char const *cmd)
/* Set close-on-exec flag on stdout_dup */
set_cloexec(stdout_dup);
r = system(cmd);
r = system1(cmd);
/* Restore original stdout */
/* If this dup2 fails... there's not a whole lot we can do. */