#include <stdio.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <stddef.h>
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#include <signal.h>
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#include <signal.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <sys/wait.h>
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/* uClinux-2.0 has vfork, but Linux 2.0 doesn't */
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/* uClinux-2.0 has vfork, but Linux 2.0 doesn't */
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#include <sys/syscall.h>
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#include <sys/syscall.h>
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#if ! defined __NR_vfork
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#if ! defined __NR_vfork
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#define vfork fork
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#define vfork fork
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#endif
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#endif
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int __libc_system(char *command)
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int __libc_system(char *command)
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{
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{
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int wait_val, pid;
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int wait_val, pid;
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__sighandler_t save_quit, save_int, save_chld;
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__sighandler_t save_quit, save_int, save_chld;
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if (command == 0)
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if (command == 0)
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return 1;
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return 1;
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save_quit = signal(SIGQUIT, SIG_IGN);
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save_quit = signal(SIGQUIT, SIG_IGN);
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save_int = signal(SIGINT, SIG_IGN);
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save_int = signal(SIGINT, SIG_IGN);
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save_chld = signal(SIGCHLD, SIG_DFL);
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save_chld = signal(SIGCHLD, SIG_DFL);
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if ((pid = vfork()) < 0) {
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if ((pid = vfork()) < 0) {
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signal(SIGQUIT, save_quit);
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signal(SIGQUIT, save_quit);
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signal(SIGINT, save_int);
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signal(SIGINT, save_int);
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signal(SIGCHLD, save_chld);
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signal(SIGCHLD, save_chld);
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return -1;
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return -1;
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}
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}
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if (pid == 0) {
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if (pid == 0) {
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signal(SIGQUIT, SIG_DFL);
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signal(SIGQUIT, SIG_DFL);
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signal(SIGINT, SIG_DFL);
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signal(SIGINT, SIG_DFL);
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signal(SIGCHLD, SIG_DFL);
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signal(SIGCHLD, SIG_DFL);
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execl("/bin/sh", "sh", "-c", command, (char *) 0);
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execl("/bin/sh", "sh", "-c", command, (char *) 0);
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_exit(127);
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_exit(127);
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}
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}
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/* Signals are not absolutly guarenteed with vfork */
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/* Signals are not absolutly guarenteed with vfork */
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signal(SIGQUIT, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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signal(SIGINT, SIG_IGN);
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signal(SIGINT, SIG_IGN);
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#if 0
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#if 0
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printf("Waiting for child %d\n", pid);
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printf("Waiting for child %d\n", pid);
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#endif
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#endif
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if (wait4(pid, &wait_val, 0, 0) == -1)
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if (wait4(pid, &wait_val, 0, 0) == -1)
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wait_val = -1;
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wait_val = -1;
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signal(SIGQUIT, save_quit);
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signal(SIGQUIT, save_quit);
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signal(SIGINT, save_int);
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signal(SIGINT, save_int);
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signal(SIGCHLD, save_chld);
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signal(SIGCHLD, save_chld);
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return wait_val;
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return wait_val;
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}
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}
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weak_alias(__libc_system, system)
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weak_alias(__libc_system, system)
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