Mac Developer Library Developer
Search

 

This manual page is part of Xcode Tools version 5.0

To obtain these tools:

If you are running a version of Xcode Tools other than 5.0, view the documentation locally:

  • In Xcode

  • In Terminal, using the man(1) command

Reading manual pages

Manual pages are intended as a quick reference for people who already understand a technology.

  • To learn how the manual is organized or to learn about command syntax, read the manual page for manpages(5).

  • For more information about this technology, look for other documentation in the Apple Developer Library.

  • For general information about writing shell scripts, read Shell Scripting Primer.




SYSTEM(3)                BSD Library Functions Manual                SYSTEM(3)

NAME
     system -- pass a command to the shell

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdlib.h>

     int
     system(const char *command);

DESCRIPTION
     The system() function hands the argument command to the command interpreter sh(1).  The calling process
     waits for the shell to finish executing the command, ignoring SIGINT and SIGQUIT, and blocking SIGCHLD.

     If command is a NULL pointer, system() will return non-zero if the command interpreter sh(1) is avail-able, available,
     able, and zero if it is not.

RETURN VALUES
     The system() function returns the exit status of the shell as returned by waitpid(2), or -1 if an error
     occurred when invoking fork(2) or waitpid(2).  A return value of 127 means the execution of the shell
     failed.

SEE ALSO
     sh(1), execve(2), fork(2), waitpid(2), popen(3)

STANDARDS
     The system() function conforms to ISO/IEC 9899:1990 (``ISO C90'') and is expected to be IEEE Std 1003.2
     (``POSIX.2'') compatible.

BSD                              June 4, 1993                              BSD

Reporting Problems

The way to report a problem with this manual page depends on the type of problem:

Content errors
Report errors in the content of this documentation with the feedback links below.
Bug reports
Report bugs in the functionality of the described tool or API through Bug Reporter.
Formatting problems
Report formatting mistakes in the online version of these pages with the feedback links below.

Feedback