mirror of
git://git.suckless.org/sbase
synced 2026-01-26 21:52:15 +00:00
f7f69125cf
Scc fixed a race condition hapenning while forking and execing the command and receiving a signal that could keep make waiting forever. Signals are correctly masked now to avoid this problems.
120 lines
1.8 KiB
C
120 lines
1.8 KiB
C
#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 200809L
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#include <signal.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include "make.h"
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static volatile pid_t pid;
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void
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killchild(void)
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{
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if (pid != 0)
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kill(pid, SIGTERM);
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pid = 0;
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}
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int
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is_dir(char *fname)
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{
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struct stat st;
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if (stat(fname, &st) < 0)
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return 0;
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return S_ISDIR(st.st_mode);
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}
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void
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exportvar(char *var, char *value)
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{
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int n;
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char *buf;
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n = snprintf(NULL, 0, "%s=%s", var, value);
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buf = emalloc(n+1);
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snprintf(buf, n+1, "%s=%s", var, value);
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putenv(buf);
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}
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time_t
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stamp(char *name)
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{
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struct stat st;
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if (stat(name, &st) < 0)
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return -1;
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return st.st_mtime;
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}
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int
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launch(char *cmd, int ignore)
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{
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int st;
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sigset_t new, old;
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char *name, *shell;
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char *args[] = {NULL, "-ec" , cmd, NULL};
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static int initsignals;
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extern char **environ;
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extern void sighandler(int);
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if (!initsignals) {
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struct sigaction act = {
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.sa_handler = sighandler
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};
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/* avoid BSD weirdness signal restart handling */
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGHUP, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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sigaction(SIGQUIT, &act, NULL);
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initsignals = 1;
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}
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sigfillset(&new);
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sigprocmask(SIG_BLOCK, &new, &old);
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if (stop)
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goto unblock;
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switch (pid = fork()) {
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case -1:
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perror("make");
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unblock:
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sigprocmask(SIG_SETMASK, &old, NULL);
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return -1;
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case 0:
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signal(SIGINT, SIG_DFL);
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signal(SIGHUP, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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signal(SIGQUIT, SIG_DFL);
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sigprocmask(SIG_SETMASK, &old, NULL);
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shell = getmacro("SHELL");
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if (ignore)
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args[1] = "-c";
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if ((name = strrchr(shell, '/')) != NULL)
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++name;
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else
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name = shell;
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args[0] = name;
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execve(shell, args, environ);
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_exit(127);
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default:
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sigprocmask(SIG_SETMASK, &old, NULL);
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wait(&st);
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return st;
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}
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}
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