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74d471d4e4
This gives us a slew of -Wextra fixes (not all of them though!) but we're actually doing it for the monotonic version of timers. This breaks some stuff, so we fix that up next. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
60 lines
1.3 KiB
Plaintext
60 lines
1.3 KiB
Plaintext
#include "config.h"
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#include <stdio.h>
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#include <string.h>
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/**
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* pipecmd - code to fork and run a command in a pipe.
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*
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* This code is a classic example of how to run a command in a child, while
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* handling the case where the exec fails.
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*
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* License: CC0 (Public domain)
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* Author: Rusty Russell <rusty@rustcorp.com.au>
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*
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* Example:
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* // Outputs HELLO WORLD
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* #include <ccan/pipecmd/pipecmd.h>
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* #include <ccan/err/err.h>
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* #include <sys/types.h>
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* #include <sys/wait.h>
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* #include <unistd.h>
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* #include <ctype.h>
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*
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* // Runs ourselves with an argument, upcases output.
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* int main(int argc, char **argv)
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* {
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* pid_t child;
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* int outputfd, i, status;
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* char input[12];
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*
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* if (argc == 2) {
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* if (write(STDOUT_FILENO, "hello world\n", 12) != 12)
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* exit(1);
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* exit(0);
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* }
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* child = pipecmd(&outputfd, NULL, NULL, argv[0], "ignoredarg", NULL);
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* if (child < 0)
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* err(1, "Creating child");
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* if (read(outputfd, input, sizeof(input)) != sizeof(input))
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* err(1, "Reading input");
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* if (waitpid(child, &status, 0) != child)
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* err(1, "Waiting for child");
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* for (i = 0; i < sizeof(input); i++)
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* printf("%c", toupper(input[i]));
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* exit(0);
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* }
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*/
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int main(int argc, char *argv[])
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{
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/* Expect exactly one argument */
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if (argc != 2)
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return 1;
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if (strcmp(argv[1], "depends") == 0) {
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printf("ccan/noerr\n");
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return 0;
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}
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return 1;
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}
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