diff options
Diffstat (limited to 'winsup/cygwin/syscalls.cc')
-rw-r--r-- | winsup/cygwin/syscalls.cc | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc index bde4d65cf..4a3114d4c 100644 --- a/winsup/cygwin/syscalls.cc +++ b/winsup/cygwin/syscalls.cc @@ -40,6 +40,7 @@ details. */ #include <limits.h> #include <unistd.h> #include <setjmp.h> +#include <sys/wait.h> #include <winnls.h> #include <wininet.h> #include <winioctl.h> @@ -3242,3 +3243,109 @@ funlockfile (FILE *file) { _funlockfile (file); } + +extern "C" FILE * +popen (const char *command, const char *type) +{ + int fds[2]; + + if (pipe (fds) < 0) + return NULL; + int fd, other_fd, __stdin, __stdout, stdwhat; + if (type[1] != '\0') + { + set_errno (EINVAL); + return NULL; + } + if (*type == 'r') + { + __stdin = -1; + stdwhat = 1; + other_fd = __stdout = fds[1]; + fd = fds[0]; + } + else if (*type == 'w') + { + __stdout = -1; + stdwhat = 0; + other_fd = __stdin = fds[0]; + fd = fds[1]; + } + else + { + set_errno (EINVAL); + return NULL; + } + + FILE *fp = fdopen (fd, type); + fcntl (fd, F_SETFD, fcntl (fd, F_GETFD, 0) | FD_CLOEXEC); + + if (!fp) + goto err; + + pid_t pid; + const char *argv[4]; + + argv[0] = "/bin/sh"; + argv[1] = "-c"; + argv[2] = command; + argv[3] = NULL; + + { + lock_process now; + int state = fcntl (stdwhat, F_GETFD, 0); + fcntl (stdwhat, F_SETFD, state | FD_CLOEXEC); + pid = spawn_guts ("/bin/sh", argv, cur_environ (), _P_NOWAIT, + __stdin, __stdout); + fcntl (stdwhat, F_SETFD, state); + } + + if (pid < 0) + goto err; + close (other_fd); + + fhandler_pipe *fh = (fhandler_pipe *) cygheap->fdtab[fd]; + fh->set_popen_pid (pid); + + return fp; + +err: + int save_errno = get_errno (); + close (fds[0]); + close (fds[1]); + set_errno (save_errno); + return NULL; +} + +int +pclose (FILE *fp) +{ + fhandler_pipe *fh = (fhandler_pipe *) cygheap->fdtab[fileno(fp)]; + + if (fh->get_device () != FH_PIPEW && fh->get_device () != FH_PIPER) + { + set_errno (EBADF); + return -1; + } + + int pid = fh->get_popen_pid (); + if (!pid) + { + set_errno (ECHILD); + return -1; + } + + if (fclose (fp)) + return -1; + + int status; + while (1) + if (waitpid (pid, &status, 0) == pid) + break; + else if (get_errno () == EINTR) + continue; + else + return -1; + + return status; +} |