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(create_subpipe): Rewrite slightly to avoid warnings from GCC 4.

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This commit is contained in:
Paul Eggert
2005-07-20 21:12:54 +00:00
parent df9a1ba4de
commit 0fab8d7b36
1 changed files with 14 additions and 24 deletions
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38
lib/subpipe.c
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@@ -100,27 +100,17 @@ pid_t
create_subpipe (char const * const *argv, int fd[2])
{
int pipe_fd[2];
int from_in_fd;
int from_out_fd;
int to_in_fd;
int to_out_fd;
int child_fd[2];
pid_t pid;
if (pipe (pipe_fd) != 0
|| (to_in_fd = fd_safer (pipe_fd[0])) < 0
|| (to_out_fd = fd_safer (pipe_fd[1])) < 0
if (pipe (child_fd) != 0
|| (child_fd[0] = fd_safer (child_fd[0])) < 0
|| (fd[0] = fd_safer (child_fd[1])) < 0
|| pipe (pipe_fd) != 0
|| (from_in_fd = fd_safer (pipe_fd[0])) < 0
|| (from_out_fd = fd_safer (pipe_fd[1])) < 0)
|| (fd[1] = fd_safer (pipe_fd[0])) < 0
|| (child_fd[1] = fd_safer (pipe_fd[1])) < 0)
error (EXIT_FAILURE, errno, "pipe");
/* Save the local variables in the parent now, in case vfork
clobbers them. */
fd[0] = to_out_fd;
fd[1] = from_in_fd;
pipe_fd[0] = to_in_fd;
pipe_fd[1] = from_out_fd;
pid = vfork ();
if (pid < 0)
error (EXIT_FAILURE, errno, "fork");
@@ -128,12 +118,12 @@ create_subpipe (char const * const *argv, int fd[2])
if (! pid)
{
/* Child. */
close (to_out_fd);
close (from_in_fd);
dup2 (to_in_fd, STDIN_FILENO);
close (to_in_fd);
dup2 (from_out_fd, STDOUT_FILENO);
close (from_out_fd);
close (fd[0]);
close (fd[1]);
dup2 (child_fd[0], STDIN_FILENO);
close (child_fd[0]);
dup2 (child_fd[1], STDOUT_FILENO);
close (child_fd[1]);
/* The cast to (char **) rather than (char * const *) is needed
for portability to older hosts with a nonstandard prototype
@@ -144,8 +134,8 @@ create_subpipe (char const * const *argv, int fd[2])
}
/* Parent. */
close (pipe_fd[0]);
close (pipe_fd[1]);
close (child_fd[0]);
close (child_fd[1]);
return pid;
}