mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
Without the bloated cplus_demangle from binutils, i.e building with:
$ make NO_DEMANGLE=1 O=~acme/git/build/perf -j3 -C tools/perf/ install
Before:
text data bss dec hex filename
471851 29280 4025056 4526187
45106b /home/acme/bin/perf
After:
[acme@doppio linux-2.6-tip]$ size ~/bin/perf
text data bss dec hex filename
446886 29232 4008576 4484694 446e56 /home/acme/bin/perf
So its a 5.3% size reduction in code, but the interesting part is in the git
diff --stat output:
19 files changed, 20 insertions(+), 1909 deletions(-)
If we ever need some of the things we got from git but weren't using, we just
have to go to the git repo and get fresh, uptodate source code bits.
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
214 lines
4 KiB
C
214 lines
4 KiB
C
#include "cache.h"
|
|
#include "run-command.h"
|
|
#include "exec_cmd.h"
|
|
|
|
static inline void close_pair(int fd[2])
|
|
{
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
}
|
|
|
|
static inline void dup_devnull(int to)
|
|
{
|
|
int fd = open("/dev/null", O_RDWR);
|
|
dup2(fd, to);
|
|
close(fd);
|
|
}
|
|
|
|
int start_command(struct child_process *cmd)
|
|
{
|
|
int need_in, need_out, need_err;
|
|
int fdin[2], fdout[2], fderr[2];
|
|
|
|
/*
|
|
* In case of errors we must keep the promise to close FDs
|
|
* that have been passed in via ->in and ->out.
|
|
*/
|
|
|
|
need_in = !cmd->no_stdin && cmd->in < 0;
|
|
if (need_in) {
|
|
if (pipe(fdin) < 0) {
|
|
if (cmd->out > 0)
|
|
close(cmd->out);
|
|
return -ERR_RUN_COMMAND_PIPE;
|
|
}
|
|
cmd->in = fdin[1];
|
|
}
|
|
|
|
need_out = !cmd->no_stdout
|
|
&& !cmd->stdout_to_stderr
|
|
&& cmd->out < 0;
|
|
if (need_out) {
|
|
if (pipe(fdout) < 0) {
|
|
if (need_in)
|
|
close_pair(fdin);
|
|
else if (cmd->in)
|
|
close(cmd->in);
|
|
return -ERR_RUN_COMMAND_PIPE;
|
|
}
|
|
cmd->out = fdout[0];
|
|
}
|
|
|
|
need_err = !cmd->no_stderr && cmd->err < 0;
|
|
if (need_err) {
|
|
if (pipe(fderr) < 0) {
|
|
if (need_in)
|
|
close_pair(fdin);
|
|
else if (cmd->in)
|
|
close(cmd->in);
|
|
if (need_out)
|
|
close_pair(fdout);
|
|
else if (cmd->out)
|
|
close(cmd->out);
|
|
return -ERR_RUN_COMMAND_PIPE;
|
|
}
|
|
cmd->err = fderr[0];
|
|
}
|
|
|
|
fflush(NULL);
|
|
cmd->pid = fork();
|
|
if (!cmd->pid) {
|
|
if (cmd->no_stdin)
|
|
dup_devnull(0);
|
|
else if (need_in) {
|
|
dup2(fdin[0], 0);
|
|
close_pair(fdin);
|
|
} else if (cmd->in) {
|
|
dup2(cmd->in, 0);
|
|
close(cmd->in);
|
|
}
|
|
|
|
if (cmd->no_stderr)
|
|
dup_devnull(2);
|
|
else if (need_err) {
|
|
dup2(fderr[1], 2);
|
|
close_pair(fderr);
|
|
}
|
|
|
|
if (cmd->no_stdout)
|
|
dup_devnull(1);
|
|
else if (cmd->stdout_to_stderr)
|
|
dup2(2, 1);
|
|
else if (need_out) {
|
|
dup2(fdout[1], 1);
|
|
close_pair(fdout);
|
|
} else if (cmd->out > 1) {
|
|
dup2(cmd->out, 1);
|
|
close(cmd->out);
|
|
}
|
|
|
|
if (cmd->dir && chdir(cmd->dir))
|
|
die("exec %s: cd to %s failed (%s)", cmd->argv[0],
|
|
cmd->dir, strerror(errno));
|
|
if (cmd->env) {
|
|
for (; *cmd->env; cmd->env++) {
|
|
if (strchr(*cmd->env, '='))
|
|
putenv((char*)*cmd->env);
|
|
else
|
|
unsetenv(*cmd->env);
|
|
}
|
|
}
|
|
if (cmd->preexec_cb)
|
|
cmd->preexec_cb();
|
|
if (cmd->perf_cmd) {
|
|
execv_perf_cmd(cmd->argv);
|
|
} else {
|
|
execvp(cmd->argv[0], (char *const*) cmd->argv);
|
|
}
|
|
exit(127);
|
|
}
|
|
|
|
if (cmd->pid < 0) {
|
|
int err = errno;
|
|
if (need_in)
|
|
close_pair(fdin);
|
|
else if (cmd->in)
|
|
close(cmd->in);
|
|
if (need_out)
|
|
close_pair(fdout);
|
|
else if (cmd->out)
|
|
close(cmd->out);
|
|
if (need_err)
|
|
close_pair(fderr);
|
|
return err == ENOENT ?
|
|
-ERR_RUN_COMMAND_EXEC :
|
|
-ERR_RUN_COMMAND_FORK;
|
|
}
|
|
|
|
if (need_in)
|
|
close(fdin[0]);
|
|
else if (cmd->in)
|
|
close(cmd->in);
|
|
|
|
if (need_out)
|
|
close(fdout[1]);
|
|
else if (cmd->out)
|
|
close(cmd->out);
|
|
|
|
if (need_err)
|
|
close(fderr[1]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int wait_or_whine(pid_t pid)
|
|
{
|
|
for (;;) {
|
|
int status, code;
|
|
pid_t waiting = waitpid(pid, &status, 0);
|
|
|
|
if (waiting < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
error("waitpid failed (%s)", strerror(errno));
|
|
return -ERR_RUN_COMMAND_WAITPID;
|
|
}
|
|
if (waiting != 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);
|
|
switch (code) {
|
|
case 127:
|
|
return -ERR_RUN_COMMAND_EXEC;
|
|
case 0:
|
|
return 0;
|
|
default:
|
|
return -code;
|
|
}
|
|
}
|
|
}
|
|
|
|
int finish_command(struct child_process *cmd)
|
|
{
|
|
return wait_or_whine(cmd->pid);
|
|
}
|
|
|
|
int run_command(struct child_process *cmd)
|
|
{
|
|
int code = start_command(cmd);
|
|
if (code)
|
|
return code;
|
|
return finish_command(cmd);
|
|
}
|
|
|
|
static void prepare_run_command_v_opt(struct child_process *cmd,
|
|
const char **argv,
|
|
int opt)
|
|
{
|
|
memset(cmd, 0, sizeof(*cmd));
|
|
cmd->argv = argv;
|
|
cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
|
|
cmd->perf_cmd = opt & RUN_PERF_CMD ? 1 : 0;
|
|
cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
|
|
}
|
|
|
|
int run_command_v_opt(const char **argv, int opt)
|
|
{
|
|
struct child_process cmd;
|
|
prepare_run_command_v_opt(&cmd, argv, opt);
|
|
return run_command(&cmd);
|
|
}
|