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authorRich Felker <dalias@aerifal.cx>2013-03-26 22:54:57 -0400
committerRich Felker <dalias@aerifal.cx>2013-03-26 22:54:57 -0400
commit00f1521fdd3f57c7a190550426537089fc24b9da (patch)
treef4b6eafdbd50b0eeef1873e66c4d6947bfae0ed7 /src
parentae7399bfd86c59b8717bb81c70b2acb20acd0f9a (diff)
downloadmusl-00f1521fdd3f57c7a190550426537089fc24b9da.tar.gz
provide emulation of fcntl F_DUPFD_CLOEXEC on old kernels
I'm not entirely happy with the amount of ugliness here, but since F_DUPFD_CLOEXEC is used elsewhere in code that's expected to work on old kernels (popen), it seems necessary. reportedly even some modern kernels went back and broke F_DUPFD_CLOEXEC (making it behave like plain F_DUPFD), so it might be necessary to add some additional fixup code later to deal with that issue too.
Diffstat (limited to 'src')
-rw-r--r--src/fcntl/fcntl.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/src/fcntl/fcntl.c b/src/fcntl/fcntl.c
index fb7806a3..390ef758 100644
--- a/src/fcntl/fcntl.c
+++ b/src/fcntl/fcntl.c
@@ -22,5 +22,21 @@ int fcntl(int fd, int cmd, ...)
if (ret) return __syscall_ret(ret);
return ex.type == F_OWNER_PGRP ? -ex.pid : ex.pid;
}
+ if (cmd == F_DUPFD_CLOEXEC) {
+ int ret = __syscall(SYS_fcntl, fd, F_DUPFD_CLOEXEC, arg);
+ if (ret != -EINVAL) {
+ if (ret >= 0)
+ __syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
+ return __syscall_ret(ret);
+ }
+ ret = __syscall(SYS_fcntl, fd, F_DUPFD_CLOEXEC, 0);
+ if (ret != -EINVAL) {
+ if (ret >= 0) __syscall(SYS_close, ret);
+ return __syscall_ret(-EINVAL);
+ }
+ ret = __syscall(SYS_fcntl, fd, F_DUPFD, arg);
+ if (ret >= 0) __syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
+ return __syscall_ret(ret);
+ }
return syscall(SYS_fcntl, fd, cmd, arg);
}