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SETSID(2) System Calls Manual SETSID(2)

setsidcreate session and set process group ID

#include <unistd.h>

pid_t
setsid(void);

The () function 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.

Upon successful completion, the () function 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, as follows:

[]
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.

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

The setsid() function is compliant with the IEEE Std 1003.1-2008 (“POSIX.1”) specification.

January 12, 2023 OpenBSD-7.5