add 'e' modifier (close-on-exec) to fopen and fdopen

this feature will be in the next version of POSIX, and can be used
internally immediately. there are many internal uses of fopen where
close-on-exec is needed to fix bugs.

diff --git a/src/stdio/__fdopen.c b/src/stdio/__fdopen.c
index 8bd51c6..df6ed71 100644 (file)
--- a/src/stdio/__fdopen.c
+++ b/src/stdio/__fdopen.c
@@ -4,7 +4,6 @@ FILE *__fdopen(int fd, const char *mode)
 {
        FILE *f;
        struct termios tio;
-       int plus = !!strchr(mode, '+');
 
        /* Check for valid initial mode character */
        if (!strchr("rwa", *mode)) {
@@ -19,7 +18,10 @@ FILE *__fdopen(int fd, const char *mode)
        memset(f, 0, sizeof *f);
 
        /* Impose mode restrictions */
-       if (!plus) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
+       if (!strchr(mode, '+')) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
+
+       /* Apply close-on-exec flag */
+       if (strchr(mode, 'e')) __syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
 
        /* Set append mode on fd if opened for append */
        if (*mode == 'a') {

diff --git a/src/stdio/fopen.c b/src/stdio/fopen.c
index 560b77e..03c10cd 100644 (file)
--- a/src/stdio/fopen.c
+++ b/src/stdio/fopen.c
@@ -17,6 +17,7 @@ FILE *fopen(const char *restrict filename, const char *restrict mode)
        else if (*mode == 'r') flags = O_RDONLY;
        else flags = O_WRONLY;
        if (strchr(mode, 'x')) flags |= O_EXCL;
+       if (strchr(mode, 'e')) flags |= O_CLOEXEC;
        if (*mode != 'r') flags |= O_CREAT;
        if (*mode == 'w') flags |= O_TRUNC;
        if (*mode == 'a') flags |= O_APPEND;