From daf3a3ed8f2ee926df416617ca7b9b3823fdfa4c Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Sun, 11 Nov 2007 23:00:38 +0000 Subject: pull code for starting helper processes out of module-gconf, clean it up, and stick into a new API pa_start_child_for_read() git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@2046 fefdeb5f-60dc-0310-8127-8f9354f1896f --- src/pulsecore/start-child.c | 162 ++++++++++++++++++++++++++++++++++++++++++++ src/pulsecore/start-child.h | 32 +++++++++ 2 files changed, 194 insertions(+) create mode 100644 src/pulsecore/start-child.c create mode 100644 src/pulsecore/start-child.h diff --git a/src/pulsecore/start-child.c b/src/pulsecore/start-child.c new file mode 100644 index 00000000..e01011d6 --- /dev/null +++ b/src/pulsecore/start-child.c @@ -0,0 +1,162 @@ +/* $Id$ */ + +/*** + This file is part of PulseAudio. + + Copyright 2007 Lennart Poettering + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + PulseAudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with PulseAudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include +#endif + +#include +#include +#include +#include +#include +#include +#include + +#ifdef HAVE_SYS_PRCTL_H +#include +#endif +#ifdef HAVE_SYS_RESOURCE_H +#include +#endif + +#include +#include + +#include "start-child.h" + +int pa_start_child_for_read(const char *name, const char *argv1, pid_t *pid) { + pid_t child; + int pipe_fds[2] = { -1, -1 }; + + if (pipe(pipe_fds) < 0) { + pa_log("pipe() failed: %s", pa_cstrerror(errno)); + goto fail; + } + + if ((child = fork()) == (pid_t) -1) { + pa_log("fork() failed: %s", pa_cstrerror(errno)); + goto fail; + + } else if (child != 0) { + + /* Parent */ + pa_assert_se(pa_close(pipe_fds[1]) == 0); + + if (pid) + *pid = child; + + return pipe_fds[0]; + } else { +#ifdef __linux__ + DIR* d; +#endif + int max_fd, i; + + /* child */ + + pa_reset_priority(); + + pa_assert_se(pa_close(pipe_fds[0]) == 0); + pa_assert_se(dup2(pipe_fds[1], 1) == 1); + + if (pipe_fds[1] != 1) + pa_assert_se(pa_close(pipe_fds[1]) == 0); + + pa_close(0); + pa_assert_se(open("/dev/null", O_RDONLY) == 0); + + pa_close(2); + pa_assert_se(open("/dev/null", O_WRONLY) == 2); + +#ifdef __linux__ + + if ((d = opendir("/proc/self/fd/"))) { + + struct dirent *de; + + while ((de = readdir(d))) { + char *e = NULL; + int fd; + + if (de->d_name[0] == '.') + continue; + + errno = 0; + fd = strtol(de->d_name, &e, 10); + pa_assert(errno == 0 && e && *e == 0); + + if (fd >= 3 && dirfd(d) != fd) + pa_close(fd); + } + + closedir(d); + } else { + +#endif + + max_fd = 1024; + +#ifdef HAVE_SYS_RESOURCE_H + { + struct rlimit r; + if (getrlimit(RLIMIT_NOFILE, &r) == 0) + max_fd = r.rlim_max; + } +#endif + + for (i = 3; i < max_fd; i++) + pa_close(i); + +#ifdef __linux__ + } +#endif + +#ifdef PR_SET_PDEATHSIG + /* On Linux we can use PR_SET_PDEATHSIG to have the helper + process killed when the daemon dies abnormally. On non-Linux + machines the client will die as soon as it writes data to + stdout again (SIGPIPE) */ + + prctl(PR_SET_PDEATHSIG, SIGTERM, 0, 0, 0); +#endif + +#ifdef SIGPIPE + /* Make sure that SIGPIPE kills the child process */ + signal(SIGPIPE, SIG_DFL); +#endif + +#ifdef SIGTERM + /* Make sure that SIGTERM kills the child process */ + signal(SIGTERM, SIG_DFL); +#endif + + execl(name, name, argv1, NULL); + _exit(1); + } + +fail: + pa_close_pipe(pipe_fds); + + return -1; +} diff --git a/src/pulsecore/start-child.h b/src/pulsecore/start-child.h new file mode 100644 index 00000000..359b5044 --- /dev/null +++ b/src/pulsecore/start-child.h @@ -0,0 +1,32 @@ +#ifndef foopulsestartchildhfoo +#define foopulsestartchildhfoo + +/* $Id$ */ + +/*** + This file is part of PulseAudio. + + Copyright 2007 Lennart Poettering + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + PulseAudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with PulseAudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#include +#include + +int pa_start_child_for_read(const char *name, const char *argv1, pid_t *pid); + +#endif -- cgit