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5aa8663c98
Put more inline comments, and also preserve errno properly from read. Suggested-by: @cdecker Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
49 lines
943 B
C
49 lines
943 B
C
#include "config.h"
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#include <ccan/noerr/noerr.h>
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#include <common/socket_close.h>
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <unistd.h>
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/* makes read() return EINTR after 5 seconds */
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static void break_read(int signum)
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{
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}
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bool socket_close(int fd)
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{
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char unused[64];
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struct sigaction act, old_act;
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int sys_res, saved_errno;
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/* We shutdown. Usually they then shutdown too, and read() gives 0 */
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sys_res = shutdown(fd, SHUT_WR);
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if (sys_res < 0) {
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close_noerr(fd);
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return false;
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}
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/* Let's not get too enthusiastic about waiting. */
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memset(&act, 0, sizeof(act));
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act.sa_handler = break_read;
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sigaction(SIGALRM, &act, &old_act);
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alarm(5);
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while ((sys_res = read(fd, unused, sizeof(unused))) > 0);
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saved_errno = errno;
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alarm(0);
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sigaction(SIGALRM, &old_act, NULL);
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if (sys_res < 0) {
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close(fd);
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errno = saved_errno;
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return false;
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}
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return close(fd) == 0;
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}
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