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13 .TH GETPID 2 "Jan 27, 2009"
15 getpid, getpgrp, getppid, getpgid \- get process, process group, and parent
22 \fBpid_t\fR \fBgetpid\fR(\fBvoid\fR);
27 \fBpid_t\fR \fBgetpgrp\fR(\fBvoid\fR);
32 \fBpid_t\fR \fBgetppid\fR(\fBvoid\fR);
37 \fBpid_t\fR \fBgetpgid\fR(\fBpid_t\fR \fIpid\fR);
43 The \fBgetpid()\fR function returns the process \fBID\fR of the calling
47 The \fBgetpgrp()\fR function returns the process group \fBID\fR of the calling
51 The \fBgetppid()\fR function returns the parent process \fBID\fR of the calling
55 The \fBgetpgid()\fR function returns the process group \fBID\fR of the process
56 whose process \fBID\fR is equal to \fIpid,\fR or the process group \fBID\fR of
57 the calling process, if \fIpid\fR is equal to 0.
61 The \fBgetpid()\fR, \fBgetpgrp()\fR, and \fBgetppid()\fR functions are always
62 successful and no return value is reserved to indicate an error.
65 Upon successful completion, \fBgetpgid()\fR returns the process group ID.
66 Otherwise, \fBgetpgid()\fR returns \fB(pid_t)\(mi1\fR and sets \fBerrno\fR to
71 The \fBgetpgid()\fR function will fail if:
78 The process whose process \fBID\fR is equal to \fIpid\fR is not in the same
79 session as the calling process, and the implementation does not allow access to
80 the process group \fBID\fR of that process from the calling process.
89 There is no process with a process \fBID\fR equal to \fIpid\fR.
94 The \fBgetpgid()\fR function may fail if:
101 The value of the \fIpid\fR argument is invalid.
107 See \fBattributes\fR(5) for descriptions of the following attributes:
115 ATTRIBUTE TYPE ATTRIBUTE VALUE
117 Interface Stability Committed
119 MT-Level Async-Signal-Safe
121 Standard See \fBstandards\fR(5).
127 \fBIntro\fR(2), \fBexec\fR(2), \fBfork\fR(2), \fBgetsid\fR(2),
128 \fBsetpgid\fR(2), \fBsetpgrp\fR(2), \fBsetsid\fR(2), \fBsignal\fR(3C),
129 \fBattributes\fR(5), \fBstandards\fR(5)