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Properly check for errors from waitpid().

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Submitted by:	gcooper
MFC after:	1 week
This commit is contained in:
John Baldwin 2011-02-15 12:42:18 +00:00
parent 56bdf2dbc2
commit ad01891403
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=218707
1 changed files with 4 additions and 4 deletions
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8
usr.bin/truss/setup.c
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@ -83,7 +83,7 @@ setup_and_wait(char *command[])
}
/* Only in the parent here */
if (waitpid(pid, &waitval, 0) < -1) {
if (waitpid(pid, &waitval, 0) < 0) {
err(1, "unexpect stop in waitpid");
return 0;
}
@ -114,7 +114,7 @@ start_tracing(int pid)
err(1, "can not attach to target process");
child_pid = pid;
if (waitpid(pid, &waitval, 0) < -1)
if (waitpid(pid, &waitval, 0) < 0)
err(1, "Unexpect stop in waitpid");
return (0);
@ -133,7 +133,7 @@ restore_proc(int signo __unused)
/* stop the child so that we can detach */
kill(child_pid, SIGSTOP);
if (waitpid(child_pid, &waitval, 0) < -1)
if (waitpid(child_pid, &waitval, 0) < 0)
err(1, "Unexpected stop in waitpid");
if (ptrace(PT_DETACH, child_pid, (caddr_t)1, 0) < 0)
@ -183,7 +183,7 @@ waitevent(struct trussinfo *info)
ptrace(PT_SYSCALL, info->pid, (caddr_t)1, pending_signal);
pending_signal = 0;
if (waitpid(info->pid, &waitval, 0) < -1) {
if (waitpid(info->pid, &waitval, 0) < 0) {
err(1, "Unexpected stop in waitpid");
}