fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-01 23:18:20 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

util: os_same_file_description: fix unknown linux < 3.5 syscall SYS_kcmp

Browse source 
https://man7.org/linux/man-pages/man2/kcmp.2.html

The kcmp() system call first appeared in Linux 3.5.

But was probably also not supported by all major platforms
at that time. So fallback to the check that is done for windows.

Signed-off-by: Thomas Devoogdt <thomas.devoogdt@barco.com>
Acked-by: Yonggang Luo <luoyonggang@gmail.com>
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18517>
This commit is contained in:
Thomas Devoogdt 2021-08-17 11:54:49 +02:00 • committed by Marge Bot
parent 8fa16452ba
commit 3ef5149824
1 changed files with 6 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
src/util/os_file.c
View file

@ -202,29 +202,23 @@ os_read_file(const char *filename, size_t *size)
/* copied from <linux/kcmp.h> */
#define KCMP_FILE 0
#endif
int
os_same_file_description(int fd1, int fd2)
{
#ifdef SYS_kcmp
pid_t pid = getpid();
#endif
/* Same file descriptor trivially implies same file description */
if (fd1 == fd2)
return 0;
#ifdef SYS_kcmp
return syscall(SYS_kcmp, pid, pid, KCMP_FILE, fd1, fd2);
}
#else
int
os_same_file_description(int fd1, int fd2)
{
/* Same file descriptor trivially implies same file description */
if (fd1 == fd2)
return 0;
/* Otherwise we can't tell */
return -1;
}
#endif
}