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m4: import patch from OpenBSD

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Use waitpid()/EINTR idiom for the specific pid, rather than generic wait()

Patch by: deraadt@

Obtained from:	OpenBSD
This commit is contained in:
Baptiste Daroussin 2019-09-09 15:24:48 +00:00
parent d031bd192e
commit fdb905e20f
1 changed files with 6 additions and 4 deletions
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10
usr.bin/m4/gnum4.c
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@ -1,4 +1,4 @@
/* $OpenBSD: gnum4.c,v 1.51 2017/06/15 13:48:42 bcallah Exp $ */
/* $OpenBSD: gnum4.c,v 1.52 2017/08/21 21:41:13 deraadt Exp $ */
/*-
* SPDX-License-Identifier: BSD-2-Clause
@ -634,7 +634,7 @@ void
doesyscmd(const char *cmd)
{
int p[2];
pid_t pid, cpid;
pid_t cpid;
char *argv[4];
int cc;
int status;
@ -672,8 +672,10 @@ doesyscmd(const char *cmd)
} while (cc > 0 || (cc == -1 && errno == EINTR));
(void) close(p[0]);
while ((pid = wait(&status)) != cpid && pid >= 0)
continue;
while (waitpid(cpid, &status, 0) == -1) {
if (errno != EINTR)
break;
}
pbstr(getstring());
}
}