From 53d445aa7571c780b8f2410afb4f326e45f851e4 Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Mon, 9 Apr 2007 13:21:33 +0000 Subject: wait4pid: if passed with pid < 0, do not set errno - it is already set by exec! --- libbb/vfork_daemon_rexec.c | 34 +++++++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) (limited to 'libbb/vfork_daemon_rexec.c') diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c index 11dbb24fc..ff2b0bceb 100644 --- a/libbb/vfork_daemon_rexec.c +++ b/libbb/vfork_daemon_rexec.c @@ -61,11 +61,43 @@ pid_t spawn(char **argv) pid_t xspawn(char **argv) { pid_t pid = spawn(argv); - if (pid < 0) bb_perror_msg_and_die("%s", *argv); + if (pid < 0) + bb_perror_msg_and_die("%s", *argv); return pid; } +// Wait for the specified child PID to exit, returning child's error return. +int wait4pid(int pid) +{ + int status; + + if (pid <= 0) { + /*errno = ECHILD; -- wrong. we expect errno to be set from failed exec */ + return -1; + } + if (waitpid(pid, &status, 0) == -1) + return -1; + if (WIFEXITED(status)) + return WEXITSTATUS(status); + if (WIFSIGNALED(status)) + return WTERMSIG(status) + 10000; + return 0; +} +int wait_nohang(int *wstat) +{ + return waitpid(-1, wstat, WNOHANG); +} + +int wait_pid(int *wstat, int pid) +{ + int r; + + do + r = waitpid(pid, wstat, 0); + while ((r == -1) && (errno == EINTR)); + return r; +} #if 0 //ndef BB_NOMMU // Die with an error message if we can't daemonize. -- cgit v1.2.3