From ebcb5d16ca911d5e21bb8071c185fb47a0c1fbb3 Mon Sep 17 00:00:00 2001 From: "Shawn O. Pearce" Date: Sat, 10 Mar 2007 03:28:05 -0500 Subject: [PATCH] Split run_command into two halves (start/finish) If the calling process wants to send data to stdin of a child process it will need to arrange for a pipe and get the child process running, feed data to it, then wait for the child process to finish. So we split the run function into two halves, allowing callers to first start the child then later finish it. Signed-off-by: Shawn O. Pearce Signed-off-by: Junio C Hamano --- run-command.c | 26 +++++++++++++++++++------- run-command.h | 3 +++ 2 files changed, 22 insertions(+), 7 deletions(-) diff --git a/run-command.c b/run-command.c index 1fb7fa5a8..a866a0669 100644 --- a/run-command.c +++ b/run-command.c @@ -2,13 +2,12 @@ #include "run-command.h" #include "exec_cmd.h" -int run_command(struct child_process *cmd) +int start_command(struct child_process *cmd) { - pid_t pid = fork(); - - if (pid < 0) + cmd->pid = fork(); + if (cmd->pid < 0) return -ERR_RUN_COMMAND_FORK; - if (!pid) { + if (!cmd->pid) { if (cmd->no_stdin) { int fd = open("/dev/null", O_RDWR); dup2(fd, 0); @@ -23,9 +22,14 @@ int run_command(struct child_process *cmd) } die("exec %s failed.", cmd->argv[0]); } + return 0; +} + +int finish_command(struct child_process *cmd) +{ for (;;) { int status, code; - pid_t waiting = waitpid(pid, &status, 0); + pid_t waiting = waitpid(cmd->pid, &status, 0); if (waiting < 0) { if (errno == EINTR) @@ -33,7 +37,7 @@ int run_command(struct child_process *cmd) error("waitpid failed (%s)", strerror(errno)); return -ERR_RUN_COMMAND_WAITPID; } - if (waiting != pid) + if (waiting != cmd->pid) return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; if (WIFSIGNALED(status)) return -ERR_RUN_COMMAND_WAITPID_SIGNAL; @@ -47,6 +51,14 @@ int run_command(struct child_process *cmd) } } +int run_command(struct child_process *cmd) +{ + int code = start_command(cmd); + if (code) + return code; + return finish_command(cmd); +} + int run_command_v_opt(const char **argv, int opt) { struct child_process cmd; diff --git a/run-command.h b/run-command.h index f9db2a7f8..24cdb4eb1 100644 --- a/run-command.h +++ b/run-command.h @@ -12,11 +12,14 @@ enum { struct child_process { const char **argv; + pid_t pid; unsigned no_stdin:1; unsigned git_cmd:1; /* if this is to be git sub-command */ unsigned stdout_to_stderr:1; }; +int start_command(struct child_process *); +int finish_command(struct child_process *); int run_command(struct child_process *); #define RUN_COMMAND_NO_STDIN 1 -- 2.30.2