14 Mar
2017
14 Mar
'17
8:14 p.m.
Nemo <cym224(a)gmail.com> wrote:
On 13 March 2017 at 06:15, Joerg Schilling
<schily(a)schily.net> wrote (in part):
In case people write POSIX compliant code...
BTW: passing the POSIX certification does not verify that the system is POSIX
compliant.
The Linux kernel does e.g. not correctly implement the waitid() syscall and the
POSIX validation test suite does not yet check for the deviation.
On a real POSIX system, the following test program passes, but this currently
only applies to Solaris, SCO UnixWare, recent FreeBSD and recent NetBSD:
/*--------------------------------------------------------------------------*/
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdio.h>
/*
* Non-standard compliant platforms may need
* #include <signal.h> or something similar
* in addition to the include files above.
*/
extern void handler(int sig, siginfo_t *sip, void *context);
extern void dosig(void);
pid_t cpid;
int
main()
{
siginfo_t si;
pid_t pid;
int ret;
dosig();
if ((pid = fork()) < 0)
exit(1);
cpid = pid;
if (pid == 0) {
_exit(1234567890);
}
ret = waitid(P_PID, pid, &si, WEXITED);
printf(" ret: %d si_pid: %ld si_status: %d si_code: %d\n",
ret,
(long) si.si_pid, si.si_status, si.si_code);
if (pid != si.si_pid)
printf("si_pid in struct siginfo should be %ld but is %ld\n",
(long) pid, (long) si.si_pid);
if (si.si_status != 1234567890)
printf("si_status in struct siginfo should be %d (0x%x) but is %d (0x%x)\n",
1234567890, 1234567890, si.si_status, si.si_status);
if (si.si_code != CLD_EXITED)
printf("si_code in struct siginfo should be %d (0x%x) but is %d (0x%x)\n",
CLD_EXITED, CLD_EXITED, si.si_code, si.si_code);
if (CLD_EXITED != 1)
printf("CLD_EXITED is %d on this platform\n", CLD_EXITED);
return (0);
}
/*
* Include it here to allow to verify that #include <sys/wait.h>
* makes siginfo_t available
*/
#include <signal.h>
void
handler(int sig, siginfo_t *sip, void *context)
{
printf("received SIGCHLD (%d), si_pid: %ld si_status: %d si_code: %d\n",
sig, (long) sip->si_pid, sip->si_status, sip->si_code);
if (sip->si_pid != cpid)
printf("SIGCHLD: si_pid in struct siginfo should be %ld but is %ld\n",
(long) cpid, (long) sip->si_pid);
if (sip->si_status != 1234567890)
printf("SIGCHLD: si_status in struct siginfo should be %d (0x%x) but is %d
(0x%x)\n",
1234567890, 1234567890, sip->si_status, sip->si_status);
if (sip->si_code != CLD_EXITED)
printf("SIGCHLD: si_code in struct siginfo should be %d (0x%x) but is %d
(0x%x)\n",
CLD_EXITED, CLD_EXITED, sip->si_code, sip->si_code);
}
void
dosig()
{
struct sigaction sa;
sa.sa_sigaction = handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART|SA_SIGINFO;
sigaction(SIGCHLD, &sa, NULL);
}
/*--------------------------------------------------------------------------*/
On Solaris, this prints something like:
received SIGCHLD (18), si_pid: 11860 si_status: 1234567890 si_code: 1
ret: 0 si_pid: 11860 si_status: 1234567890 si_code: 1
On Linux, it prints something like:
received SIGCHLD (17), si_pid: 5434 si_status: 210 si_code: 1
SIGCHLD: si_status in struct siginfo should be 1234567890 (0x499602d2) but is 210 (0xd2)
ret: 0 si_pid: 5434 si_status: 210 si_code: 1
si_status in struct siginfo should be 1234567890 (0x499602d2) but is 210 (0xd2)
Jörg
--
EMail:joerg@schily.net (home) Jörg Schilling D-13353 Berlin
joerg.schilling(a)fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.org/private/ http://sourceforge.net/projects/schilytools/files/
Given that there have been many problems last
time, there was a collaboration
between the Linux people and the OpenGroup:
http://www.opengroup.org/personal/ajosey/tr20-08-2005.txt
I would guess that this company dod modify software inorder to become compliant.
As they note (http://developer.huawei.com/ict/en/site-euleros ):
Derived from the source-code for the CentOS distribution. In due
course, I may try it. If this actually works back to most
distributions, it *may* one day become possible to actually have
Linux-distro-derived code compile on Unix systems.