getsid — get session ID
#include <unistd.h>
pid_t
getsid( |
pid_t | pid) ; |
getsid(0)
returns the session ID of the calling process. getsid(p)
returns the session
ID of the process with process ID p
. (The session ID of a
process is the process group ID of the session leader.)
On success, a session ID is returned. On error, (pid_t)
−1 will be returned, and errno
is set appropriately.
A process with process ID p
exists, but it is not
in the same session as the current process, and the
implementation considers this an error.
No process with process ID p
was found.
Linux does not return EPERM.
Linux has this system call since Linux 1.3.44. There is libc support since libc 5.2.19.
To get the prototype under glibc, define both _XOPEN_SOURCE
and _XOPEN_SOURCE_EXTENDED
, or use "#define
_XOPEN_SOURCE n
"
for some integer n
larger than or equal to 500.
getpgid(2), setsid(2), credentials(7), feature_test_macros(7)
|