45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/*
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* Copyright (c) 2013 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* stdlib/system.c
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* Execute a shell command.
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*/
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#include <sys/wait.h>
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#include <stdlib.h>
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#include <unistd.h>
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int system(const char* command)
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{
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const int ret_error = command ? -1 : 0;
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const int exit_error = command ? 127 : 0;
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if ( !command )
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command = "exit 1";
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// TODO: Block SIGHCHLD, SIGINT, anda SIGQUIT while waiting.
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pid_t childpid = fork();
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if ( childpid < 0 )
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return ret_error;
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if ( childpid )
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{
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int status;
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if ( waitpid(childpid, &status, 0) < 0 )
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return ret_error;
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return status;
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}
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execlp("sh", "sh", "-c", command, (const char*) NULL);
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_exit(exit_error);
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}
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