使用z/OS UNIX System Services在CICS中运行shell命令

本示例展示了如何在CICS中通过z/OS UNIX System Services运行shell命令，并在CICS中显示命令输出。在CICS中运行shell命令可以扩展CICS的功能。

#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#define SHELL_COMMAND "ls"

void runShellCommand() {
    int fdPipe[2];
    char buf[1024];
    int bytesRead;

    if (pipe(fdPipe) == -1) {
        fprintf(stderr, "Failed to create pipe: %s\n", strerror(errno));
        exit(1);
    }

    int child_pid = fork();

    if (child_pid == -1) {
        fprintf(stderr, "Failed to fork child process: %s\n", strerror(errno));
        exit(1);
    }

    if (child_pid == 0) {
        if (dup2(fdPipe[1], STDOUT_FILENO) == -1) {
            fprintf(stderr, "Failed to redirect stdout: %s\n", strerror(errno));
            exit(1);
        }
        close(fdPipe[0]);
        close(fdPipe[1]);

        char *shellCommandArgv[] = { SHELL_COMMAND, NULL };
        execvp(SHELL_COMMAND, shellCommandArgv);

        fprintf(stderr, "Failed to execute shell command: %s\n", strerror(errno));
        exit(1);
    }

    close(fdPipe[1]);

    memset(buf, 0, sizeof(buf));
    bytesRead = read(fdPipe[0], buf, sizeof(buf) - 1);
    const char *end = buf + bytesRead;
    const char *start = buf;

    while (start < end) {
        const char *nextLine = strchr(start, '\n');
        if (nextLine != NULL) {
            *nextLine = '\0';
            printf("%s\n", start);
            start = nextLine + 1;
        } else {
            break;
        }
    }

    close(fdPipe[0]);
    int status;
    waitpid(child_pid, &status, 0);

    if (status != 0) {
        fprintf(stderr, "Shell command exited with status: %d\n", status);
    }
}

int main(int argc, char **argv) {
    runShellCommand();
    return 0;
}

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