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getpid(2) [hpux man page]

getpid(2)							System Calls Manual							 getpid(2)

NAME
getpid(), getpgid(), getpgrp(), getpgrp2(), getppid() - get process, process group and parent process ID. SYNOPSIS
DESCRIPTION
These functions return process, process group and parent process IDs, as follows: Process group ID of the specified process. If pid is zero, the call applies to the calling process. Same result as Process group ID of the calling process. Process group ID of the specified process. If pid is zero, the call applies to the calling process. Same result as Process ID of the calling process. Parent process ID of the calling process. If the parent process is the initialization process (known as the call returns 1. Security Restrictions The system call is subject to compartmental restrictions. See compartments(5) for more information about compartmentalization on systems that support that feature. Compartmental restrictions can be overridden if the process possesses the privilege (PRIV_COMMALLOWED). Processes owned by the superuser may not have this privilege. Processes owned by any user may have this privilege, depending on system configuration. See privileges(5) for more information about privileged access on systems that support fine-grained privileges. RETURN VALUE
The functions return the following values: Successful completion. n is a nonnegative process ID, as described above. Failure: and only. is set to indicate the error. ERRORS
If or fails, is set to one of the following values: [EPERM] The current process and pid are not in the same session (see setsid(2)). [ESRCH] No process can be found corresponding to that specified by pid. AUTHOR
and were developed by HP, AT&T, and the University of California, Berkeley. SEE ALSO
exec(2), fork(2), setpgid(2), setsid(2), signal(5). STANDARDS CONFORMANCE
getpid(2)

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getpid(2)							   System Calls 							 getpid(2)

NAME
getpid, getpgrp, getppid, getpgid - get process, process group, and parent process IDs SYNOPSIS
#include <unistd.h> pid_t getpid(void); pid_t getpgrp(void); pid_t getppid(void); pid_t getpgid(pid_t pid); DESCRIPTION
The getpid() function returns the process ID of the calling process. The getpgrp() function returns the process group ID of the calling process. The getppid() function returns the parent process ID of the calling process. The getpgid() function returns the process group ID of the process whose process ID is equal to pid, or the process group ID of the calling process, if pid is equal to 0. RETURN VALUES
Upon successful completion, these functions return the process group ID. Otherwise, getpgid() returns (pid_t)-1 and sets errno to indicate the error. ERRORS
The getpgid() function will fail if: EPERM The process whose process ID is equal to pid is not in the same session as the calling process, and the implementation does not allow access to the process group ID of that process from the calling process. ESRCH There is no process with a process ID equal to pid. The getpgid() function may fail if: EINVAL The value of the pid argument is invalid. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
intro(2), exec(2), fork(2), getsid(2), setpgid(2), setpgrp(2), setsid(2), signal(3C), attributes(5), standards(5) SunOS 5.10 28 Dec 1996 getpid(2)
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