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tap: Avoid extra iterations while closing file fd 

Avoid iterations for fd 0, 1 & 2 when we are closing file fds in child process.

Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Pankaj Gupta 2014-03-12 22:24:27 +05:30 committed by Stefan Hajnoczi
parent 0e96643c98
commit 13a12f869b
1 changed files with 4 additions and 10 deletions
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14
net/tap.c
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@ -367,11 +367,8 @@ static int launch_script(const char *setup_script, const char *ifname, int fd)
if (pid == 0) {
int open_max = sysconf(_SC_OPEN_MAX), i;
for (i = 0; i < open_max; i++) {
if (i != STDIN_FILENO &&
i != STDOUT_FILENO &&
i != STDERR_FILENO &&
i != fd) {
for (i = 3; i < open_max; i++) {
if (i != fd) {
close(i);
}
}
@ -452,11 +449,8 @@ static int net_bridge_run_helper(const char *helper, const char *bridge)
char br_buf[6+IFNAMSIZ] = {0};
char helper_cmd[PATH_MAX + sizeof(fd_buf) + sizeof(br_buf) + 15];
for (i = 0; i < open_max; i++) {
if (i != STDIN_FILENO &&
i != STDOUT_FILENO &&
i != STDERR_FILENO &&
i != sv[1]) {
for (i = 3; i < open_max; i++) {
if (i != sv[1]) {
close(i);
}
}