update-index: allow --index-info to add higher stages.
[git] / run-command.c
1 #include "cache.h"
2 #include "run-command.h"
3 #include <sys/wait.h>
4
5 int run_command_v(int argc, char **argv)
6 {
7         pid_t pid = fork();
8
9         if (pid < 0)
10                 return -ERR_RUN_COMMAND_FORK;
11         if (!pid) {
12                 execvp(argv[0], (char *const*) argv);
13                 die("exec %s failed.", argv[0]);
14         }
15         for (;;) {
16                 int status, code;
17                 int retval = waitpid(pid, &status, 0);
18
19                 if (retval < 0) {
20                         if (errno == EINTR)
21                                 continue;
22                         error("waitpid failed (%s)", strerror(retval));
23                         return -ERR_RUN_COMMAND_WAITPID;
24                 }
25                 if (retval != pid)
26                         return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
27                 if (WIFSIGNALED(status))
28                         return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
29
30                 if (!WIFEXITED(status))
31                         return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
32                 code = WEXITSTATUS(status);
33                 if (code)
34                         return -code;
35                 return 0;
36         }
37 }
38
39 int run_command(const char *cmd, ...)
40 {
41         int argc;
42         char *argv[MAX_RUN_COMMAND_ARGS];
43         const char *arg;
44         va_list param;
45
46         va_start(param, cmd);
47         argv[0] = (char*) cmd;
48         argc = 1;
49         while (argc < MAX_RUN_COMMAND_ARGS) {
50                 arg = argv[argc++] = va_arg(param, char *);
51                 if (!arg)
52                         break;
53         }
54         va_end(param);
55         if (MAX_RUN_COMMAND_ARGS <= argc)
56                 return error("too many args to run %s", cmd);
57         return run_command_v(argc, argv);
58 }