[Rpm-maint] PATCH 2/2013 Add missing header against WEXITSTATUS

[Kamil Rytarowski]

Hello,

I'm attaching a patch with the following change-log:
Add missing header against WEXITSTATUS()

WEXITSTATUS is defined in sys/wait.h.

Please apply the patch.

As a side note this code (build/pack.c) looks suspicious:

static rpmRC checkPackages(char *pkgcheck)
{
 int fail = rpmExpandNumeric("%{?_nonzero_exit_pkgcheck_terminate_build}");
 int xx;

 rpmlog(RPMLOG_NOTICE, _("Executing \"%s\":\n"), pkgcheck);
 xx = system(pkgcheck);
 if (WEXITSTATUS(xx) == -1 || WEXITSTATUS(xx) == 127) {
rpmlog(RPMLOG_ERR, _("Execution of \"%s\" failed.\n"), pkgcheck);
if (fail) return RPMRC_NOTFOUND;
 }
 if (WEXITSTATUS(xx) != 0) {
rpmlog(RPMLOG_ERR, _("Package check \"%s\" failed.\n"), pkgcheck);
if (fail) return RPMRC_FAIL;
 }

 return RPMRC_OK;
}

1. We lost errno.
2. WEXITSTATUS(xx) == -1 does the standard guarantee that this evaluates on all POSIX Unices as true? From what I saw in Unix manuals [1] here the result status is evaluated to low-order byte, so it would be better to compare it with 255 (to ignore signed/unsigned conversions), or better: to stop using WEXITSTATUS macro for this particular scenario and compare xx as it is with -1.

[1] like http://modman.unixdev.net/?sektion=2&page=WEXITSTATUS&manpath=SunOS-4.1.3
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