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authorUlrich Drepper <drepper@redhat.com>2004-02-25 23:28:54 +0000
committerUlrich Drepper <drepper@redhat.com>2004-02-25 23:28:54 +0000
commitd024596d616ed20e04dcfacc06bd77d8d1e2b64b (patch)
tree884df26233619a0af179a8b39651825587169ec7 /sysdeps/unix
parent25b8e63c0a109ccd8fc9ebfd4bed8faffa0e47f2 (diff)
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Update.
2004-02-25 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/sysconf.c (__sysconf): Handle _SC_NGROUPS_MAX.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r--sysdeps/unix/sysv/linux/sysconf.c38
1 files changed, 36 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/sysconf.c b/sysdeps/unix/sysv/linux/sysconf.c
index e07c502cc3..842c8794d0 100644
--- a/sysdeps/unix/sysv/linux/sysconf.c
+++ b/sysdeps/unix/sysv/linux/sysconf.c
@@ -1,5 +1,5 @@
/* Get file-specific information about a file. Linux version.
- Copyright (C) 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -17,6 +17,7 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
+#include <fcntl.h>
#include <sysdep.h>
#include <time.h>
#include <unistd.h>
@@ -46,7 +47,40 @@ __sysconf (int name)
}
#endif
+ case _SC_NGROUPS_MAX:
+ {
+ /* Try to read the information from the /proc/sys/kernel/ngroups_max
+ file. */
+ int fd = __open ("/proc/sys/kernel/ngroups_max", O_RDONLY);
+ if (fd != -1)
+ {
+ /* This is more than enough, the file contains a single
+ integer. */
+ char buf[32];
+ long int res = -1l;
+
+ ssize_t n = __read (fd, buf, sizeof (buf) - 1);
+ if (n > 0)
+ {
+ /* Terminate the string. */
+ buf[n] = '\0';
+
+ char *endp;
+ res = strtol (buf, &endp, 10);
+ if (endp == buf || (*endp != '\0' && *endp != '\n'))
+ res = -1l;
+ }
+
+ __close (fd);
+
+ if (res != -1)
+ return res;
+ }
+ }
+ break;
+
default:
- return posix_sysconf (name);
+ break;
}
+ return posix_sysconf (name);
}