SIMPLE SOLUTIONS

SETSID(2FREEBSD) - man page online | system calls

Create session and set process group ID.

Chapter
June 4, 1993
SETSID(2)                            BSD System Calls Manual                            SETSID(2)

NAME

setsid — create session and set process group ID

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <unistd.h> pid_t setsid(void);

DESCRIPTION

The setsid() system call creates a new session. The calling process is the session leader of the new session, is the process group leader of a new process group and has no control‐ ling terminal. The calling process is the only process in either the session or the process group.

RETURN VALUES

Upon successful completion, the setsid() system call returns the value of the process group ID of the new process group, which is the same as the process ID of the calling process. If an error occurs, setsid() returns -1 and the global variable errno is set to indicate the error.

ERRORS

The setsid() system call will fail if: [EPERM] The calling process is already a process group leader, or the process group ID of a process other than the calling process matches the process ID of the calling process.

SEE ALSO

setpgid(2), tcgetpgrp(3), tcsetpgrp(3)

STANDARDS

The setsid() system call is expected to be compliant with the ISO/IEC 9945-1:1990 (“POSIX.1”) specification.
BSD June 4, 1993 BSD
This manual Reference Other manuals
setsid(2freebsd) referred by
refer to setpgid(2) | setsid(2) | tcgetpgrp(3)