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net/tap: Use qemu_close_all_open_fd()

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Instead of using a slow implementation to close all open fd after
forking, use qemu_close_all_open_fd().

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240802145423.3232974-6-cleger@rivosinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Clément Léger 2024-08-02 16:54:21 +02:00 committed by Richard Henderson
parent 7532ca570a
commit 9996a35c64
1 changed files with 12 additions and 5 deletions
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17
net/tap.c
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@ -387,13 +387,20 @@ static TAPState *net_tap_fd_init(NetClientState *peer,
static void close_all_fds_after_fork(int excluded_fd)
{
int open_max = sysconf(_SC_OPEN_MAX), i;
const int skip_fd[] = {STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO,
excluded_fd};
unsigned int nskip = ARRAY_SIZE(skip_fd);
for (i = 3; i < open_max; i++) {
if (i != excluded_fd) {
close(i);
}
/*
* skip_fd must be an ordered array of distinct fds, exclude
* excluded_fd if already included in the [STDIN_FILENO - STDERR_FILENO]
* range
*/
if (excluded_fd <= STDERR_FILENO) {
nskip--;
}
qemu_close_all_open_fd(skip_fd, nskip);
}
static void launch_script(const char *setup_script, const char *ifname,