GETSID(2) Linux Programmer s Manual GETSID(2)

NAME getsid - get session ID

SYNOPSIS #include <unistd.h>

pid_t getsid(pid_t pid);

DESCRIPTION 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 error, (pid_t) -1 will be returned, and errno is set appropriately.

ERRORS EPERM 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.

ESRCH No process with process ID p was found.


NOTES 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 inte- ger n larger than or equal to 500.

SEE ALSO getpgid(2), setsid(2), feature_test_macros(7)

Linux 2.5.0 2001-12-17 GETSID(2)