diff options
Diffstat (limited to 'src/libstddjb/doublefork.c')
-rw-r--r-- | src/libstddjb/doublefork.c | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/src/libstddjb/doublefork.c b/src/libstddjb/doublefork.c deleted file mode 100644 index da512f8..0000000 --- a/src/libstddjb/doublefork.c +++ /dev/null @@ -1,50 +0,0 @@ -/* ISC license. */ - -#include <sys/wait.h> -#include <unistd.h> -#include <errno.h> -#include <skalibs/uint64.h> -#include <skalibs/allreadwrite.h> -#include <skalibs/djbunix.h> - -pid_t doublefork () -{ - char pack[8] ; - int fd[2] ; - pid_t child ; - if (pipe(fd) == -1) return -1 ; - child = fork() ; - switch (child) - { - case -1: - { - fd_close(fd[1]) ; - fd_close(fd[0]) ; - return -1 ; - } - case 0: - { - pid_t pid ; - fd_close(fd[0]) ; - pid = fork() ; - switch (pid) - { - case -1: _exit(errno) ; - case 0: fd_close(fd[1]) ; return 0 ; - } - uint64_pack_big(pack, pid) ; - _exit((allwrite(fd[1], pack, 8) < 8) ? errno : 0) ; - } - } - fd_close(fd[1]) ; - { - uint64_t grandchild = 0 ; - int wstat ; - if (allread(fd[0], pack, 8) < 8) grandchild = 1 ; - fd_close(fd[0]) ; - wait_pid(child, &wstat) ; - if (grandchild) return (errno = WIFSIGNALED(wstat) ? EINTR : WEXITSTATUS(wstat), -1) ; - uint64_unpack_big(pack, &grandchild) ; - return (pid_t)grandchild ; - } -} |