396 lines
7.8 KiB
C
396 lines
7.8 KiB
C
#include "cache.h"
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#include "run-command.h"
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#include "exec_cmd.h"
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static inline void close_pair(int fd[2])
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{
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close(fd[0]);
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close(fd[1]);
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}
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static inline void dup_devnull(int to)
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{
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int fd = open("/dev/null", O_RDWR);
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dup2(fd, to);
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close(fd);
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}
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int start_command(struct child_process *cmd)
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{
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int need_in, need_out, need_err;
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int fdin[2], fdout[2], fderr[2];
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/*
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* In case of errors we must keep the promise to close FDs
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* that have been passed in via ->in and ->out.
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*/
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need_in = !cmd->no_stdin && cmd->in < 0;
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if (need_in) {
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if (pipe(fdin) < 0) {
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if (cmd->out > 0)
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close(cmd->out);
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return -ERR_RUN_COMMAND_PIPE;
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}
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cmd->in = fdin[1];
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}
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need_out = !cmd->no_stdout
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&& !cmd->stdout_to_stderr
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&& cmd->out < 0;
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if (need_out) {
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if (pipe(fdout) < 0) {
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if (need_in)
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close_pair(fdin);
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else if (cmd->in)
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close(cmd->in);
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return -ERR_RUN_COMMAND_PIPE;
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}
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cmd->out = fdout[0];
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}
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need_err = !cmd->no_stderr && cmd->err < 0;
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if (need_err) {
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if (pipe(fderr) < 0) {
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if (need_in)
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close_pair(fdin);
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else if (cmd->in)
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close(cmd->in);
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if (need_out)
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close_pair(fdout);
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else if (cmd->out)
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close(cmd->out);
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return -ERR_RUN_COMMAND_PIPE;
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}
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cmd->err = fderr[0];
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}
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#ifndef __MINGW32__
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fflush(NULL);
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cmd->pid = fork();
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if (!cmd->pid) {
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if (cmd->no_stdin)
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dup_devnull(0);
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else if (need_in) {
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dup2(fdin[0], 0);
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close_pair(fdin);
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} else if (cmd->in) {
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dup2(cmd->in, 0);
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close(cmd->in);
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}
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if (cmd->no_stderr)
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dup_devnull(2);
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else if (need_err) {
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dup2(fderr[1], 2);
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close_pair(fderr);
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}
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if (cmd->no_stdout)
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dup_devnull(1);
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else if (cmd->stdout_to_stderr)
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dup2(2, 1);
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else if (need_out) {
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dup2(fdout[1], 1);
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close_pair(fdout);
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} else if (cmd->out > 1) {
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dup2(cmd->out, 1);
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close(cmd->out);
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}
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if (cmd->dir && chdir(cmd->dir))
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die("exec %s: cd to %s failed (%s)", cmd->argv[0],
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cmd->dir, strerror(errno));
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if (cmd->env) {
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for (; *cmd->env; cmd->env++) {
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if (strchr(*cmd->env, '='))
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putenv((char*)*cmd->env);
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else
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unsetenv(*cmd->env);
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}
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}
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if (cmd->preexec_cb)
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cmd->preexec_cb();
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if (cmd->perf_cmd) {
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execv_perf_cmd(cmd->argv);
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} else {
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execvp(cmd->argv[0], (char *const*) cmd->argv);
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}
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exit(127);
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}
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#else
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int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
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const char **sargv = cmd->argv;
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char **env = environ;
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if (cmd->no_stdin) {
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s0 = dup(0);
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dup_devnull(0);
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} else if (need_in) {
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s0 = dup(0);
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dup2(fdin[0], 0);
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} else if (cmd->in) {
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s0 = dup(0);
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dup2(cmd->in, 0);
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}
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if (cmd->no_stderr) {
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s2 = dup(2);
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dup_devnull(2);
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} else if (need_err) {
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s2 = dup(2);
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dup2(fderr[1], 2);
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}
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if (cmd->no_stdout) {
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s1 = dup(1);
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dup_devnull(1);
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} else if (cmd->stdout_to_stderr) {
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s1 = dup(1);
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dup2(2, 1);
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} else if (need_out) {
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s1 = dup(1);
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dup2(fdout[1], 1);
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} else if (cmd->out > 1) {
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s1 = dup(1);
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dup2(cmd->out, 1);
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}
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if (cmd->dir)
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die("chdir in start_command() not implemented");
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if (cmd->env) {
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env = copy_environ();
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for (; *cmd->env; cmd->env++)
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env = env_setenv(env, *cmd->env);
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}
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if (cmd->perf_cmd) {
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cmd->argv = prepare_perf_cmd(cmd->argv);
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}
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cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
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if (cmd->env)
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free_environ(env);
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if (cmd->perf_cmd)
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free(cmd->argv);
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cmd->argv = sargv;
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if (s0 >= 0)
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dup2(s0, 0), close(s0);
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if (s1 >= 0)
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dup2(s1, 1), close(s1);
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if (s2 >= 0)
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dup2(s2, 2), close(s2);
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#endif
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if (cmd->pid < 0) {
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int err = errno;
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if (need_in)
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close_pair(fdin);
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else if (cmd->in)
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close(cmd->in);
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if (need_out)
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close_pair(fdout);
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else if (cmd->out)
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close(cmd->out);
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if (need_err)
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close_pair(fderr);
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return err == ENOENT ?
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-ERR_RUN_COMMAND_EXEC :
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-ERR_RUN_COMMAND_FORK;
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}
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if (need_in)
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close(fdin[0]);
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else if (cmd->in)
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close(cmd->in);
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if (need_out)
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close(fdout[1]);
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else if (cmd->out)
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close(cmd->out);
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if (need_err)
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close(fderr[1]);
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return 0;
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}
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static int wait_or_whine(pid_t pid)
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{
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for (;;) {
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int status, code;
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pid_t waiting = waitpid(pid, &status, 0);
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if (waiting < 0) {
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if (errno == EINTR)
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continue;
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error("waitpid failed (%s)", strerror(errno));
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return -ERR_RUN_COMMAND_WAITPID;
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}
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if (waiting != pid)
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return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
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if (WIFSIGNALED(status))
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return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
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if (!WIFEXITED(status))
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return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
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code = WEXITSTATUS(status);
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switch (code) {
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case 127:
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return -ERR_RUN_COMMAND_EXEC;
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case 0:
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return 0;
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default:
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return -code;
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}
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}
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}
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int finish_command(struct child_process *cmd)
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{
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return wait_or_whine(cmd->pid);
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}
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int run_command(struct child_process *cmd)
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{
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int code = start_command(cmd);
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if (code)
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return code;
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return finish_command(cmd);
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}
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static void prepare_run_command_v_opt(struct child_process *cmd,
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const char **argv,
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int opt)
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{
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memset(cmd, 0, sizeof(*cmd));
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cmd->argv = argv;
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cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
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cmd->perf_cmd = opt & RUN_PERF_CMD ? 1 : 0;
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cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
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}
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int run_command_v_opt(const char **argv, int opt)
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{
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struct child_process cmd;
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prepare_run_command_v_opt(&cmd, argv, opt);
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return run_command(&cmd);
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}
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int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
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{
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struct child_process cmd;
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prepare_run_command_v_opt(&cmd, argv, opt);
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cmd.dir = dir;
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cmd.env = env;
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return run_command(&cmd);
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}
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#ifdef __MINGW32__
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static __stdcall unsigned run_thread(void *data)
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{
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struct async *async = data;
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return async->proc(async->fd_for_proc, async->data);
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}
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#endif
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int start_async(struct async *async)
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{
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int pipe_out[2];
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if (pipe(pipe_out) < 0)
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return error("cannot create pipe: %s", strerror(errno));
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async->out = pipe_out[0];
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#ifndef __MINGW32__
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/* Flush stdio before fork() to avoid cloning buffers */
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fflush(NULL);
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async->pid = fork();
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if (async->pid < 0) {
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error("fork (async) failed: %s", strerror(errno));
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close_pair(pipe_out);
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return -1;
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}
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if (!async->pid) {
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close(pipe_out[0]);
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exit(!!async->proc(pipe_out[1], async->data));
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}
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close(pipe_out[1]);
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#else
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async->fd_for_proc = pipe_out[1];
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async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
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if (!async->tid) {
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error("cannot create thread: %s", strerror(errno));
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close_pair(pipe_out);
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return -1;
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}
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#endif
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return 0;
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}
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int finish_async(struct async *async)
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{
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#ifndef __MINGW32__
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int ret = 0;
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if (wait_or_whine(async->pid))
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ret = error("waitpid (async) failed");
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#else
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DWORD ret = 0;
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if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
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ret = error("waiting for thread failed: %lu", GetLastError());
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else if (!GetExitCodeThread(async->tid, &ret))
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ret = error("cannot get thread exit code: %lu", GetLastError());
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CloseHandle(async->tid);
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#endif
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return ret;
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}
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int run_hook(const char *index_file, const char *name, ...)
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{
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struct child_process hook;
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const char **argv = NULL, *env[2];
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char index[PATH_MAX];
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va_list args;
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int ret;
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size_t i = 0, alloc = 0;
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if (access(perf_path("hooks/%s", name), X_OK) < 0)
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return 0;
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va_start(args, name);
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ALLOC_GROW(argv, i + 1, alloc);
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argv[i++] = perf_path("hooks/%s", name);
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while (argv[i-1]) {
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ALLOC_GROW(argv, i + 1, alloc);
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argv[i++] = va_arg(args, const char *);
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}
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va_end(args);
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memset(&hook, 0, sizeof(hook));
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hook.argv = argv;
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hook.no_stdin = 1;
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hook.stdout_to_stderr = 1;
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if (index_file) {
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snprintf(index, sizeof(index), "PERF_INDEX_FILE=%s", index_file);
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env[0] = index;
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env[1] = NULL;
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hook.env = env;
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}
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ret = start_command(&hook);
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free(argv);
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if (ret) {
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warning("Could not spawn %s", argv[0]);
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return ret;
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}
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ret = finish_command(&hook);
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if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
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warning("%s exited due to uncaught signal", argv[0]);
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return ret;
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}
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