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#include "cache.h"
#include "run-command.h"
#include <sys/wait.h>
static int run_external_command(int argc, const char **argv)
{
pid_t pid = fork();
if (pid < 0)
return -ERR_RUN_COMMAND_FORK;
if (!pid) {
execvp(argv[0], (char *const*) argv);
return -ERR_RUN_COMMAND_EXEC;
}
for (;;) {
int status, code;
int retval = waitpid(pid, &status, 0);
if (retval < 0) {
if (errno == EINTR)
continue;
error("waitpid failed (%s)", strerror(retval));
return -ERR_RUN_COMMAND_WAITPID;
}
if (retval != pid)
return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
if (WIFSIGNALED(status))
return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
if (!WIFEXITED(status))
return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
code = WEXITSTATUS(status);
if (code)
return -code;
return 0;
}
}
int run_command(const char *cmd, ...)
{
int argc;
const char *argv[MAX_RUN_COMMAND_ARGS];
const char *arg;
va_list param;
fprintf(stderr, "run-command %s (%d)\n", cmd, ERR_RUN_COMMAND_EXEC);
va_start(param, cmd);
argv[0] = cmd;
argc = 1;
while (argc < MAX_RUN_COMMAND_ARGS) {
arg = argv[argc++] = va_arg(param, char *);
if (!arg)
break;
}
va_end(param);
if (MAX_RUN_COMMAND_ARGS <= argc)
return error("too many args to run %s", cmd);
return run_external_command(argc, argv);
}
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