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setsid(2) [freebsd man page]

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 controlling 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

Check Out this Related Man Page

setsid(2)							System Calls Manual							 setsid(2)

NAME
setsid - create session and set process group ID SYNOPSIS
DESCRIPTION
If the calling process is not a process group leader, creates a new session. The calling process becomes the session leader of this new session, it becomes the process group leader of a new process group, and it has no controlling terminal. The process group ID of the call- ing process is set equal to the process ID of the calling process. The calling process is the only process in the new process group and the only process in the new session. Security Restrictions Some or all of the actions associated with this system call may require privileges. See privileges(5) for more information. RETURN VALUE
Upon successful completion, returns the value of the new process group ID of the calling process. Otherwise, it returns a value of and sets to indicate the error. ERRORS
If fails, no changes occur and (see errno(2)) is set to one of the following values: 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. The calling process does not have sufficient privileges. AUTHOR
was developed by HP and AT&T. SEE ALSO
exec(2), exit(2), fork(2), getpid(2), kill(2), setpgid(2), setpgrp(2), setpgrp3(2), signal(2), privileges(5), termio(7). STANDARDS CONFORMANCE
setsid(2)

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