diff options
Diffstat (limited to 'man2/setresuid.2')
| -rw-r--r-- | man2/setresuid.2 | 45 |
1 files changed, 21 insertions, 24 deletions
diff --git a/man2/setresuid.2 b/man2/setresuid.2 index 081a8e920a..874db6f25f 100644 --- a/man2/setresuid.2 +++ b/man2/setresuid.2 @@ -97,14 +97,28 @@ for it is .BR CAP_SETGID . .SH VERSIONS -These calls are available under Linux since Linux 2.1.44. +.SS C library/kernel differences +At the kernel level, user IDs and group IDs are a per-thread attribute. +However, POSIX requires that all threads in a process +share the same credentials. +The NPTL threading implementation handles the POSIX requirements by +providing wrapper functions for +the various system calls that change process UIDs and GIDs. +These wrapper functions (including those for +.BR setresuid () +and +.BR setresgid ()) +employ a signal-based technique to ensure +that when one thread changes credentials, +all of the other threads in the process also change their credentials. +For details, see +.BR nptl (7). .SH STANDARDS -These calls are nonstandard; -they also appear on HP-UX and some of the BSDs. -.SH NOTES -Under HP-UX and FreeBSD, the prototype is found in -.IR <unistd.h> . -Under Linux, the prototype is provided since glibc 2.3.2. +None. +.SH HISTORY +Linux 2.1.44, +glibc 2.3.2. +HP-UX, FreeBSD. .PP The original Linux .BR setresuid () @@ -121,23 +135,6 @@ The glibc and .BR setresgid () wrapper functions transparently deal with the variations across kernel versions. -.\" -.SS C library/kernel differences -At the kernel level, user IDs and group IDs are a per-thread attribute. -However, POSIX requires that all threads in a process -share the same credentials. -The NPTL threading implementation handles the POSIX requirements by -providing wrapper functions for -the various system calls that change process UIDs and GIDs. -These wrapper functions (including those for -.BR setresuid () -and -.BR setresgid ()) -employ a signal-based technique to ensure -that when one thread changes credentials, -all of the other threads in the process also change their credentials. -For details, see -.BR nptl (7). .SH SEE ALSO .BR getresuid (2), .BR getuid (2), |