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SYSTEM (3) FreeBSD Library Functions Manual SYSTEM (3)

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SYSTEM (3) FreeBSD 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 ∗string);

DESCRIPTION

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

Ifstringis aNULLpointer,system() will return non-zero if the command interpretersh(1) is available, and zero if it is not.

The system() function returns the exit status of the shell as returned by waitpid(2), or −1 if an error occurred when invokingfork(2) orwaitpid(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

Thesystem() function conforms toISO/IEC9899:1990 (“ISO C90”) and is expected to beIEEEStd 1003.2 (“POSIX.2”) compatible.

FreeBSD 5.4 June 4, 1993 1

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