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file: patch process stdin to /dev/null

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This prevents broken pipe errors in executed child processes that
attempt to access stdin.

Suggested-by: Vytautas Virvičius <vy.virvicius@gmail.com>
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This commit is contained in:
Jo-Philipp Wich 2018-12-21 09:09:55 +01:00
parent 2e8106ac56
commit 67118a6b33
1 changed files with 8 additions and 1 deletions
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9
file.c
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@ -597,6 +597,7 @@ rpc_file_exec_run(const char *cmd,
{ {
pid_t pid; pid_t pid;
int devnull;
int opipe[2]; int opipe[2];
int epipe[2]; int epipe[2];
@ -629,10 +630,16 @@ rpc_file_exec_run(const char *cmd,
case 0: case 0:
uloop_done(); uloop_done();
devnull = open("/dev/null", O_RDWR);
if (devnull == -1)
return UBUS_STATUS_UNKNOWN_ERROR;
dup2(devnull, 0);
dup2(opipe[1], 1); dup2(opipe[1], 1);
dup2(epipe[1], 2); dup2(epipe[1], 2);
close(0); close(devnull);
close(opipe[0]); close(opipe[0]);
close(opipe[1]); close(opipe[1]);
close(epipe[0]); close(epipe[0]);